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Cavern of Souls When casting a spell, if there is any mana already in the player's pool, the most recently produced colored mana is automatically applied to the spell first. For example, if a player taps a Cavern of Souls (naming Human), then an Island, then casts Delver of Secrets, the blue mana applied to the Delver's mana cost will be that from the Island. If the player tapped the Island, then the Cavern, the Cavern's mana would be applied to the spell, and it would be appropriately uncounterable. Unclassified
Platinum Emperion If you control Platinum Emperion you cannot even pay 0 life for costs. Disadvantageous
Gaddock Teeg Gaddock Teeg incorrectly does not allow cards with converted mana cost 4 or greater to be spliced onto other cards. Advantageous
Karn Liberated If Karn Liberated restarts the game, there is a display issue with shocklands such as Steam Vents. Unclassified
Karn Liberated Restarting the game with Karn Liberated does not remove the City's Blessing. Unclassified
Myr Servitor If Lazav, Multifarious is a copy of another creature that references other copies of itself such as Myr Servitor, it will incorrectly refer to other copies of Lazav. Unclassified
Reviving Vapors Reviving Vapors doesn't cause you to gain life. Disadvantageous
Verdant Eidolon There is a known issue with Verdant Eidolon creating too much mana. Unclassified
Fiery Temper Some cards with the madness ability do not display the correct reminder text. Notably, this includes Fiery Temper. Unclassified
Shirei, Shizo's Caretaker If control of Grave Betrayal or Shirei, Shizo's Caretaker changes between a creature dying and the delayed EOT trigger going on the stack, the new controller gets the creature rather than the player who created the delayed trigger. Disadvantageous
Buried Alive The order of cards put into the graveyard by Buried Alive is random Disadvantageous
Daybreak Coronet Daybreak Coronet can be cast targeting a creature with only an equipment attached to it. Advantageous
Containment Priest If Containment Priest and any other creatures (not cast) ETB at the same time, all the other creatures get exiled Disadvantageous
Containment Priest Containment Priest exiles Theros Gods even when their devotion isn't met. Advantageous
Jace, Cunning Castaway Illusion tokens created by Jace, Cunning Castaway have redundant blue text. Graphical
Lazav, the Multifarious If Lazav, Multifarious is a copy of another creature that references other copies of itself such as Myr Servitor, it will incorrectly refer to other copies of Lazav. Unclassified
Steam Vents If Karn Liberated restarts the game, there is a display issue with shocklands such as Steam Vents. Unclassified
Discovery // Dispersal Dispersal of Discovery // Dispersal ignores the converted mana cost of double-faced lands such as Azcanta, the Sunken Ruin. Unclassified
Goblin Electromancer With two copies of Goblin Electromancer in play, splice costs are incorrectly calculated. Unclassified
Crackling Drake Creatures with variable power and toughness such as Crackling Drake are not correctly updated in the reveal zone. Unclassified
Walking Ballista If a player attempts to cast Walking Ballista with a cost reduction effect, they are initially prompted to pay for X=127. They can adjust this to the correct number. Unclassified
Grafdigger's Cage If you manifest a creature with Grafdigger's Cage in play, it will be exiled. Disadvantageous
Mimic Vat Mimic Vat will return previously exiled card to the graveyard incorrectly if you say 'Yes' to the trigger when the target has been exiled Advantageous
Winds of Rath Spells and non-static abilities that care whether a permanent is enchanted, will see equipped permanent as enchanted Advantageous
Terminus Cards with the miracle mechanic such as Terminus incorrectly retain their miracle blue text reminder when they are not cast. Unclassified
Entreat the Angels When Entreat the Angels is on the stack with 0 chosen for X, the blue text that typically indicates the value of X does not appear. Graphical
Vaevictis Asmadi, the Dire The triggered ability of Vaevictis Asmadi, the Dire can sometimes completely remove cards from the game. Disadvantageous
Blade of Selves There is an issue when creating multiple tokens from the myriad ability on cards such as Blade of Selves. Unclassified
Skullbriar, the Walking Grave Skullbriar, the Walking Grave can cause the client to crash if it moves to the command zone with +1/+1 counters. Unclassified
Relic Crush Relic Crush can target the same permanent twice. Unclassified
Hunted Dragon The tokens created by Hunted Dragon have Banding in addition to first strike Graphical
Spell Crumple There are known issues with giving flashback to a spell that is put on the bottom of a library as it resolves. Unclassified
Fact or Fiction Fact or Fiction chooses an opponent before revealing in multiplayer Disadvantageous
Doubling Season Doubling Season incorrectly doubles lore counters on sagas placed during the draw step. Advantageous
Muldrotha, the Gravetide Muldrotha, the Gravetide does not allow you to cast cards from your graveyard with As Foretold. Disadvantageous
Merfolk Trickster Merfolk Trickster doesn't remove abilities granted to the targeted creature by a different source. Disadvantageous
Grenzo, Dungeon Warden Abilities that generate replacement effects preventing specific cards from being put into graveyards (such as those found on Progenitus or Blightsteel Colossus) do not function properly while resolving Grenzo, Dungeon Warden's activated ability. Unclassified
Animar, Soul of Elements Animar, Soul of Elements can cause slowdown with an excessive amount of counters on it. Unclassified
Rancor If Rancor falls off a land that was a creature temporarily that turn, it will incorrectly trigger during the next turn's upkeep. Advantageous
Courser of Kruphix Courser of Kruphix incorrectly shows the top card with shocklands Advantageous
Zada, Hedron Grinder Abilities that trigger from a permanent becoming the target of a spell or ability (such as that of Silverfur Partisan) are not triggered by copies of spells automatically put onto the stack. For example: if a player controls Zada, Hedron Grinder and casts a spell on Zada, when Zada's triggered ability resolves, the player will be prompted to choose targets for the copies made by Zada. If the player chooses targets for the copies individually, Silverfur Partisan's ability will trigger correctly. If the player clicks OK to automatically choose the targets, the Partisan's ability won't trigger. Unclassified
Vesuvan Shapeshifter If Vesuvan Shapeshifter copies a Megamorph creature with it's face-up ability, it will retain the Megamorph ability in later turns, gaining +1/+1 counters. Advantageous
Mutiny Mutiny doesn't have clear targeting information. Workaround: the game log displays targets matching the order written on the card, and will highlight the appropriate creature when its name is hovered over with the mouse. Unclassified
Gisela, the Broken Blade There is an issue adding meld cards to your deck Disadvantageous
Garruk Relentless Only the front sides of Archangel Avacyn and Garruk, the Veil-Cursed are taken into account for Commander color identity. Disadvantageous
Garruk Relentless The art for the wolf token created by Garruk, the Veil-Cursed is incorrect. Graphical
Bruna, the Fading Light Brisela, Voice of Nightmares incorrectly has a converted mana cost of 13. Unclassified
Archangel Avacyn Only the front sides of Archangel Avacyn and Garruk, the Veil-Cursed are taken into account for Commander color identity. Disadvantageous
Primal Amulet If you cast a card you don't own with Primal Wellspring, the copy is cast by the card's owner. Disadvantageous
Search for Azcanta Dispersal of Discovery // Dispersal ignores the converted mana cost of double-faced lands such as Azcanta, the Sunken Ruin. Unclassified
Rosheen Meanderer Rosheen Meanderer is unable to contribute mana to spells that ask an opponent to pay X, such as Condescend. Disadvantageous
Wall of Roots The mana abilities of Wall of Roots and Kozilek's Translator cannot be activated while paying the mana cost of a spell or ability. Players can still activate these abilities at any time that player has priority. Disadvantageous
Phantom Tiger If Phantom Tiger dies in combat, blue text abilities it had been granted do not apply to that combat's damage. Disadvantageous
Fireball Fireball cannot be cast with 0 targets when X = 0. Disadvantageous
Elesh Norn, Grand Cenobite If Containment Priest and Elesh Norn, Grand Cenobite are both Exhumed, Elesh Norn, Grand Cenobite is exiled and her effect lasts indefinitely. Advantageous
Austere Command Austere Command does not respect 711.4b and treats the converted mana cost of the back side of double-faced permanents as 0. Disadvantageous
Gishath, Sun's Avatar Gishath, Sun's Avatar does not allow you to decline to put a Dinosaur creature into play if you have one in your hand. Disadvantageous
Sword-Point Diplomacy A player can pay more life than they have with Sword-Point Diplomacy, but they will still most likely lose the game. Unclassified
Sword-Point Diplomacy Sword-Point Diplomacy is buggy in multiplayer Advantageous
Sanguine Sacrament There are known issues with giving flashback to a spell that is put on the bottom of a library as it resolves. Unclassified
Eldrazi Spawn Eldrazi Spawn and Scions created by cards from the Battle for Zendikar and Rise of the Eldrazi sets display "Add {1} to your mana pool" instead of "Add {C} to your mana pool" upon zoom. As this change in template was not a functional change, these tokens continue to function correctly. Unclassified
Eldrazi Spawn Eldrazi Spawn and Scions created by cards from the Battle for Zendikar and Rise of the Eldrazi sets display "Add {1} to your mana pool" instead of "Add {C} to your mana pool" Graphical
Door of Destinies If a permanent enters the battlefield as a copy of a permanent that had a choice made as it entered (such as Door of Destinies or Painter's Servant), the copy correctly allows the controller to make a new choice, but the abilities of the copy that refer to that choice do not function correctly. Disadvantageous
Nazahn, Revered Bladesmith Nazahn, Revered Bladesmith will sometimes give the equipment it finds to another player's hand. Disadvantageous
Kess, Dissident Mage Kess Dissident Mage's ability allows you to cast spells during other players' turns and to cast spells with no mana costs Advantageous
Hollow One Hollow One's cost reduction doesn't consider split cards that are discarded Disadvantageous
God-Pharaoh's Gift The Scarab God and God-Pharaoh's Gift do not respect 706.9d and replaces characteristic defining abilities when creating copies of creatures. Unclassified
The Scarab God The Scarab God and God-Pharaoh's Gift do not respect 706.9d and replaces characteristic defining abilities when creating copies of creatures. Unclassified
Torment of Hailfire The undo function works incorrectly with Torment of Hailfire. Disadvantageous
Sunscourge Champion Sunscourge Champion will cause you to lose life if it has negative power when its trigger resolves. Disadvantageous
Solemnity Solemnity does not prevent a player from paying tribute from cards such as Oracle of Bones. Unclassified
Overwhelming Splendor Creatures with ascend can still grant the City's Blessing with Overwhelming Splendor on the battlefield. Disadvantageous
Gideon Jura Certain effect shields, such as the indestructible one created by Gideon Jura, sometimes display slightly longer than they should. Unclassified
Icefall Regent If you target an [Icefall Regent] with a fused split card, you must pay {2} for each side of the split card, for a total of {4} Advantageous
Compulsive Research Dredging rather than drawing can let you avoid discarding Advantageous
Terastodon If some (not all) of Terastodon's targets are indestructible permanent(s), it will incorrectly create elephant token(s) for the owner of those permanents. Advantageous
Cut // Ribbons Split cards such as Cut // Ribbons are reported as 3 cards in the chat log. Unclassified
Cut // Ribbons Split cards such as Cut // Ribbons are reported as 3 cards in the chat log. Unclassified
Rags // Riches If a commander is chosen for Riches in Rags // Riches, no other opponents need to choose a creature. Disadvantageous
Commit // Memory If you cast Commit // Memory targeting another Commit // Memory, a rare issue may occur that causes it to not be placed correctly within the library. Disadvantageous
Commit // Memory If you cast Commit // Memory targeting another Commit // Memory, a rare issue may occur that causes it to not be placed correctly within the library. Disadvantageous
Harsh Mentor Harsh Mentor's triggered ability also affects abilities activated from creatures in the graveyard. Advantageous
Vizier of Many Faces Vizier of Many Faces keeps its abilities when an opponent controls Overwhelming Splendor. Advantageous
Naga Oracle Some spells that let you look at the top cards of your library and choose multiple cards one-by-one to send to the graveyard will incorrectly display the visual order of the chosen cards in the graveyard. Graphical
As Foretold As Foretold does not apply to cards able to be cast due to Abandoned Sarcophagus. Disadvantageous
Gideon's Intervention Casting a second copy of Gideon's Intervention causes the first to become become partially non-functional, allowing the named card to deal damage Disadvantageous
Secret Salvage Secret Salvage does not add the cards found from the library to the revealed zone. Graphical
Fortune's Favor Fortune's Favor does not indicate which pile is face up Graphical
Krond the Dawn-Clad Spells and non-static abilities that care whether a permanent is enchanted, will see equipped permanent as enchanted Advantageous
Dreampod Druid Spells and non-static abilities that care whether a permanent is enchanted, will see equipped permanent as enchanted Advantageous
Kozilek, the Great Distortion When a player casts Kozilek, the Great Distortion, its triggered ability incorrectly triggers if the casting player has seven or more cards in hand. Upon resolution, the player will not draw cards if he or she already has seven or more cards in hand. Unclassified
Reflecting Pool Reflecting Pool does not get the ability to add any color of mana to your mana pool from Crumbling Vestige. Disadvantageous
Kaya, Ghost Assassin If Kaya, Ghost Assassin exiles a commander with the first ability, and its controller chooses not to replace exile with the command zone, the commander will still go to the command zone until Kaya returns it. Unconfirmed
Custodi Lich Custodi Lich's sacrifice trigger happens when you create the monarchy, and whenever an opponent becomes the monarch. Advantageous
Windbrisk Heights Cards exiled by the triggered abilities of a number of cards which exile a card from their controller's library appear to be coming from the opponent's library instead. This affects cards such as Bomat Courier, Windbrisk Heights, and other similar cards. This is a display issue only. Unclassified
Sunforger The activated ability of Sunforger does not shuffle the library. Disadvantageous
Whims of the Fates Whims of the Fates Causes client crashes Game Breaking
Identity Thief Identity Thief Restarts the game when attempting to copy a creature. Game Breaking
Fleetwheel Cruiser Fleetwheel Cruiser does not correctly display changes in power and toughness with Tempered Steel. Graphical
Bomat Courier Cards exiled by the triggered abilities of a number of cards which exile a card from their controller's library appear to be coming from the opponent's library instead. This affects cards such as Bomat Courier, Windbrisk Heights, and other similar cards. This is a display issue only. Unclassified
Animation Module Animation Module does not trigger off of cards with unleash such as Gore-House Chainwalker. Disadvantageous
Lost Legacy Cards that allow a player to search their opponent's library and remove a named card, such as Lost Legacy, are not allowing the player to remove named split cards. Unclassified
Vedalken Shackles Vedalken Shackles interacts incorrectly with creatures that enter the battlefield tapped and attacking. Unclassified
Painter's Servant If a permanent enters the battlefield as a copy of a permanent that had a choice made as it entered (such as Door of Destinies or Painter's Servant), the copy correctly allows the controller to make a new choice, but the abilities of the copy that refer to that choice do not function correctly. Disadvantageous
Mire's Toll When only some cards from an opponent's hand are revealed, they do not appear in the revealed zone Disadvantageous
Hanweir Battlements There is an issue adding meld cards to your deck Disadvantageous
Tangleclaw Werewolf Fibrous Entangler (Flipped Tangleclaw Werewolf) tries to force players who it is not attacking in multiplayer to block it, locking the game as they cannot make a legal block Game Breaking
Nahiri's Wrath The prompt box of Nahiri's Wrath displays incorrect text. Unclassified
Nahiri's Wrath The prompt box for the additional cost of Nahiri's Wrath contains a grammatical error when selecting a single target. Unclassified
Graf Rats There is an issue adding meld cards to your deck Disadvantageous
Contingency Plan Some spells that let you look at the top cards of your library and choose multiple cards one-by-one to send to the graveyard will incorrectly display the visual order of the chosen cards in the graveyard. Graphical
Emrakul, the Promised End Casting two copies of Emrakul, the Promised End does not give the opponent two extra turns. Unclassified
Distended Mindbender When only some cards from an opponent's hand are revealed, they do not appear in the revealed zone Disadvantageous
Sigarda, Heron's Grace Sigarda, Heron's Grace doesn't grant you hexproof Disadvantageous
The Gitrog Monster Non-land permanents that have become lands due to an enchantment, such as Imprisoned in the Moon, do not trigger the third ability of The Gitrog Monster when put into the graveyard Disadvantageous
Silverfur Partisan Abilities that trigger from a permanent becoming the target of a spell or ability (such as that of Silverfur Partisan) are not triggered by copies of spells automatically put onto the stack. For example: if a player controls Zada, Hedron Grinder and casts a spell on Zada, when Zada's triggered ability resolves, the player will be prompted to choose targets for the copies made by Zada. If the player chooses targets for the copies individually, Silverfur Partisan's ability will trigger correctly. If the player clicks OK to automatically choose the targets, the Partisan's ability won't trigger. Unclassified
Silverfur Partisan Abilities that trigger from a permanent becoming the target of a spell or ability (such as that of Silverfur Partisan) are not triggered by copies of spells automatically put onto the stack. For example: if a player controls Zada, Hedron Grinder and casts a spell on Zada, when Zada's triggered ability resolves, the player will be prompted to choose targets for the copies made by Zada. If the player chooses targets for the copies individually, Silverfur Partisan's ability will trigger correctly. If the player clicks OK to automatically choose the targets, the Partisan's ability won't trigger. Unclassified
Seasons Past There are known issues with giving flashback to a spell that is put on the bottom of a library as it resolves. Unclassified
Fork in the Road Fork in the Road fails to display the destination zones of the chosen lands in the game log. Unclassified
Harness the Storm Harness the Storm Doesn't trigger when casting split cards. Disadvantageous
Heir of Falkenrath If Heir of Falkenrath's ability is used to transform it into Heir to the Night, then it transforms back into Heir of Falkenrath in the same turn in some way, its activated ability can be used again. Advantageous
Ever After Ever After resolves immediately upon selection of the second target instead of allowing the player to click a "Done" button. Unclassified
Ever After There are known issues with giving flashback to a spell that is put on the bottom of a library as it resolves. Unclassified
Odric, Lunarch Marshal Odric, Lunarch Marshal's triggered ability ignores the hexproof ability on a creature if it only has it temporarily. Unclassified
Reflector Mage If a player casts Reflector Mage targeting a creature they own, and then in the following turn their opponent casts Reflector Mage, they are able to immediately recast that creature. Advantageous
Oath of Nissa If a player makes a selection, then reverses that selection with the "undo" keyboard shortcut (default: CTRL+Z), the game log will sometimes incorrectly show both cards the player selected. Notably, this includes Oath of Nissa and similar effects that ask a player to put one of a small number of cards into their hand. Unclassified
Bonds of Mortality Bonds of Mortality gives everything hexproof? Disadvantageous
Kalitas, Traitor of Ghet If you control Kalitas, Traitor of Ghet, you create a zombie creature token when a creature you control owned by an opponent dies. Unclassified
Kozilek's Translator The mana abilities of Wall of Roots and Kozilek's Translator cannot be activated while paying the mana cost of a spell or ability. Players can still activate these abilities at any time that player has priority. Disadvantageous
Deceiver of Form If Deceiver of Form's triggered ability turns creatures into copies of a legendary creature, the legend rule fails to apply to the copies. Advantageous
Flamerush Rider The token created by Flamerush Rider does not enter the battlefield tapped and attacking. Unclassified
Synthetic Destiny Synthetic Destiny and Mass Polymorph do not take commanders into account when determining the number of creatures to reveal. Disadvantageous
Mirror Match Mirror Match Non-creature permanents that become creatures temporarily are incorrectly considered blocked by the token copies Advantageous
Broodbirth Viper Broodbirth Viper's token(s) don't get exiled at the end of combat Advantageous
Ulamog, the Ceaseless Hunger Cards that are exiled by Ulamog, the Ceaseless Hunger incorrectly show association arrows while in the Exiled Zone. Graphical
Bonded Construct Under rare circumstances, a player who controls two creatures that can't attack alone (such as Bonded Construct) but must attack with one of them will be able to attack with only that creature rather than being required to attack with both. Unclassified
The Great Aurora The Great Aurora shuffles tokens into your library that you can then draw. Unclassified
Necromantic Summons The spell mastery ability of Necromantic Summons does not function. Unclassified
Profane Command Profane Command If a player gains shroud in response to Profane Command, the first mode will still resolve / choosing to give creatures fear when you control no creatures prompts a large number. Advantageous
Cursed Scroll Cursed Scroll does not deal damage if choosing to click the card in your hand, rather than typing the name. Graphical
Atarka's Command Atarka's Command's first activated ability doesn't appear in the Effect zone after it resolves. Unclassified
Collected Company If metallic mimic and a creature of the chosen type enter the battlefield through collected company, the system will incorrectly give that creature a +1/+1 counter Advantageous
Collected Company Collected Company does not allow you to put fewer than the maximum number of creatures onto the battlefield. Disadvantageous
Crypt of Agadeem Crypt of Agadeem does not make mana with its second ability. Unclassified
Infinite Reflection Infinite Reflection All creatures become copies, not just ones you control. Advantageous
Angelic Field Marshal Angelic Field Marshal still grants a bonus to your commander when an opponent gains control of it. Advantageous
Mishra's Workshop When there are floating generic mana and restricted mana (such as [Mishra's Workshop] mana) that are same color (or same colorless), MTGO will always use generic mana first before using the restricted mana. Workaround: don't float the generic mana if you want to use the restricted mana first Disadvantageous
Hada Freeblade Certain cards, such as Hada Freeblade, do not display a legality error for the Pauper format in the collection scene. Graphical
City of Brass Drain Power does not function correctly when the targeted player controls City of Brass. Unclassified
Taigam's Scheming Some spells that let you look at the top cards of your library and choose multiple cards one-by-one to send to the graveyard will incorrectly display the visual order of the chosen cards in the graveyard. Graphical
Phyrexian Revoker Phyrexian Revoker can name the Momir Vig, Simic Visionary Avatar. Unclassified
Phyrexian Revoker If a card such as Phyrexian Revoker that asks you to name a card is manifested, you are asked to name the card as it enters the battlefield. Unclassified
Yisan, the Wanderer Bard If all of Yisan, the Wanderer Bard's verse counters are removed in response to its ability, you are able to search your library for any creature, regardless of CMC. Advantageous
Undergrowth Scavenger Creatures that enter the battlefield with counters based on the number of creatures in the graveyard (for example, Undergrowth Scavenger) do not count themselves if they are put onto the battlefield directly from the graveyard. Unclassified
Life's Legacy Cards cast with conspire that require a player to sacrifice a creature as an additional cost to cast, such as Life's Legacy and Momentous Fall, incorrectly look at the power and toughness of the last creature clicked for conspire. Disadvantageous
Circle of Flame Cards that are only common in the PRM set can be added to Pauper decks, but you can't join a Pauper match with decks that have those cards Disadvantageous
Xathrid Slyblade Xathrid Slyblade does not lose hexproof when its ability is activated. Advantageous
Lurking Evil Lurking Evil makes you pay life equal to half of your opponent's life total Advantageous
Tromokratis Tromokratis can cause the game the game to soft-lock in multiplayer games Game Breaking
Keranos, God of Storms Keranos, God of Storms does not trigger when its controller draws a card. Unclassified
Athreos, God of Passage Athreos, God of Passage does not associate its triggers with specific creatures. Graphical
Feast of Dreams Spells and non-static abilities that care whether a permanent is enchanted, will see equipped permanent as enchanted Advantageous
Jace, Architect of Thought The first ability of Jace, Architect of Thought is not creating an effect shield. Unclassified
Oracle of Bones Solemnity does not prevent a player from paying tribute from cards such as Oracle of Bones. Unclassified
Floodtide Serpent Instead of bouncing an enchantment, attacking with Floodtide Serpent shows you all zones. Advantageous
Pyxis of Pandemonium When multiple Pyxis of Pandemonium are in the battlefield, there is no indicator how many cards are exiled by each Pyxis, or which cards are exiled by each Pyxis Graphical
Disciple of Phenax When only some cards from an opponent's hand are revealed, they do not appear in the revealed zone Disadvantageous
Progenitus Abilities that generate replacement effects preventing specific cards from being put into graveyards (such as those found on Progenitus or Blightsteel Colossus) do not function properly while resolving Grenzo, Dungeon Warden's activated ability. Unclassified
Tooth and Nail Using the undo function with an entwined Tooth and Nail does not allow you to put two creatures onto the battlefield. Unclassified
Thieving Sprite When only some cards from an opponent's hand are revealed, they do not appear in the revealed zone Disadvantageous
Death Cloud Death Cloud causes Soft Lock after Life Loss step occurs Game Breaking
Kira, Great Glass-Spinner Kira, Great-Glass Spinner's ability does not grant the appropriate triggered ability. Unclassified
Careful Consideration Copy spells that care about being cast during a main phase such as Careful Consideration sometimes do not confer the main phase bonus. Unclassified
Sorin, Lord of Innistrad If Sorin, Lord of Innistrad somehow becomes a creature, he cannot target himself with his ultimate ability. Unclassified
Sylvan Primordial Casting Sylvan Primordial causes the game to be soft-locked in a multiplayer game if there are no legal targets for one player. Game Breaking
Structural Collapse Structural Collapse doesn't cause target to sacrifice either an artifact or land. Disadvantageous
Zodiac Rooster Cards that are only common in the PRM set can be added to Pauper decks, but you can't join a Pauper match with decks that have those cards Disadvantageous
Headless Horseman Cards that are only common in the PRM set can be added to Pauper decks, but you can't join a Pauper match with decks that have those cards Disadvantageous
Grave Betrayal If control of Grave Betrayal or Shirei, Shizo's Caretaker changes between a creature dying and the delayed EOT trigger going on the stack, the new controller gets the creature rather than the player who created the delayed trigger. Disadvantageous
Vesuva If Vesuva copies a land with a static ability and then is later turned into a basic land (perhaps by a Blood Moon or Spreading Seas), that static ability will not be removed. Triggered and activated abilities are correctly removed. Advantageous
Mindclaw Shaman You are unable to cast split cards with Mindclaw Shaman's ability. Disadvantageous
Defy Death If Defy Death targets an Angel, it does not put +1/+1 counters on it. Unclassified
Koth of the Hammer When controlling the Emblem of Koth of the Hammer, lands do not display the blue text they have. Graphical
Kruin Outlaw If a Werewolf such as Kruin Outlaw copies another creature and then would transform, it incorrectly does not transform. Unclassified
Tempered Steel Fleetwheel Cruiser does not correctly display changes in power and toughness with Tempered Steel. Graphical
Pollen Lullaby Pollen Lullaby does not display the rules text stating that the creature doesn't untap. Unclassified
Grand Architect Pili-Pala can incorrectly pay for its own untap ability by tapping to use the ability granted by Grand Architect. Advantageous
Harm's Way Harm's Way cannot redirect combat damage to planeswalkers. Unclassified
Knowledge Pool Knowledge Pool With multiple Knowledge Pools in play, casting a spell from hand lets you cast a spell from each Pool. Advantageous
Blightsteel Colossus Abilities that generate replacement effects preventing specific cards from being put into graveyards (such as those found on Progenitus or Blightsteel Colossus) do not function properly while resolving Grenzo, Dungeon Warden's activated ability. Unclassified
Primitive Justice Primitive Justice will either not cast/restart the game with a single target. Game Breaking
Lich Lich If you cannot sacrifice enough permanents, the game restarts Game Breaking
Drain Power Drain Power does not function correctly when the targeted player controls City of Brass. Unclassified
Island Sanctuary Island Sanctuary's replacement effect is available if you draw a card during an opponents draw step Advantageous
Semblance Anvil Semblance Anvil imprinting a split card does not reduce any casting costs. Disadvantageous
Mass Polymorph Synthetic Destiny and Mass Polymorph do not take commanders into account when determining the number of creatures to reveal. Disadvantageous
Tajuru Preserver The chat log displays incorrect text when a player is to sacrifice permanents but cannot by controlling a card such as Tajuru Preserver. Unclassified
Momentous Fall Cards cast with conspire that require a player to sacrifice a creature as an additional cost to cast, such as Life's Legacy and Momentous Fall, incorrectly look at the power and toughness of the last creature clicked for conspire. Disadvantageous
Umbra Mystic Enchantments granted Totem Armor by Umbra Mystic don't become sacrificed Advantageous
Amulet of Vigor If a player controls two or more Amulet of Vigors, Magic Online will automatically stack all triggers from the Amulets together, rather than allowing players to choose how to stack their triggers. Unclassified
Bala Ged Thief When only some cards from an opponent's hand are revealed, they do not appear in the revealed zone Disadvantageous
Gauntlets of Chaos Gauntlets of Chaos allows you to target illegal targets. Unclassified
Ramses Overdark Spells and non-static abilities that care whether a permanent is enchanted, will see equipped permanent as enchanted Advantageous
Nebuchadnezzar Nebuchadnezzar ability makes the game start endlessly repeating itself Game Breaking
Freyalise's Winds Freyalise's Winds Anytime a permanent with a wind counter would be untapped outside of the untap step, a wind counter is removed rather than it becoming untapped. Disadvantageous
Liu Bei, Lord of Shu The ability of Liu Bei, Lord of Shu does not function. Non-Functional ability
Unscythe, Killer of Kings Unscythe, Killer of Kings's effect procs when unequipped. Advantageous
Sages of the Anima Sages of the Anima puts the non-creature cards on top of the library instead of the bottom. Disadvantageous
Prince of Thralls Prince of Thralls asks its owner to pay life instead of the opponent. Advantageous
Godsire The art for the tokens created by [Godsire] is incorrect. Graphical
Phyrexian Portal Phyrexian Portal doesn't let the owner see the pile they have chosen or choose a card Disadvantageous
Rogue Skycaptain Rogue Skycaptain's upkeep cost is {0}. Advantageous
Evershrike If you activate Evershrike's ability multiple times before having it get reanimated, each trigger will let you attach an aura. Advantageous
Glamerdye When you change the color in a card's text, the card won't show the new chosen color in the cards itself, in the tooltip, and not in the zoomed version Graphical
Umbral Mantle When you untap a mana-producing creature as part of cost to activate an ability, MTGO wrongly allows you to tap that creature for mana in the middle of payng the cost Advantageous
Pili-Pala Pili-Pala can incorrectly pay for its own untap ability by tapping to use the ability granted by Grand Architect. Advantageous
Mana Reflection Mana Reflection doesn't double mana produced by mana abilities that provide mana in any combination of colors Disadvantageous
Cragganwick Cremator Cragganwick Cremator is unable to deal damage to planeswalkers. Disadvantageous
Release the Ants If a player has no cards left in their library, both players will lose a clash from cards such as Release the Ants. Unclassified
Cairn Wanderer Some specific protections (Snow or specificially spectra ward) are not counted as protections to be gained or shared Disadvantageous
Fire Covenant If Fire Covenant is cast for x=0 and you pay the 1 extra mana that MTGO asks you to (which is the bug), the game will restarts. Workaround: Undo the process if you encounter this bug, and never cast it for x=0 Avoidable Game Breaking
Pox The calculation code seems to be wrong, because one third of three (3) is calculated as two (2) Advantageous
Mind Bend Cards that ask you to choose "a basic land type or a color word" only let you choose a basic land type. Disadvantageous
Cloud Key Players are unable to correctly select a card type Non-Functional ability
Patrician's Scorn You can't pay the alternate cost of Patrician's Scorn Disadvantageous
Oriss, Samite Guardian Using Oriss, Samite Guardian's Grandeur ability during controller's precombat main phase will not allow controller to attack that turn. Disadvantageous
Barren Glory Barren Glory does not check intervening if clause during resolution Advantageous
Fa'adiyah Seer Fa'adiyah Seer and Sindbad's ability won't discard non-land card drawn if there is any dredge card in your graveyard Advantageous
Volcano Hellion Volcano Hellion's damage is capped at 255 Disadvantageous
Null Profusion Null Profusion triggers when another player casts its owner's cards Advantageous
Jodah's Avenger Jodah's Avenger's activated ability doesn't work correctly. Disadvantageous
Porphyry Nodes Porphyry Nodes allows a creature to regenerate if it's tied for the least power. Disadvantageous
Dust Elemental Dust Elemental only returns two creatures if its controller only controls exactly three creatures (including Dust Elemental itself) Advantageous
Gemstone Caverns There is a rare issue that can occur with Gemstone Caverns that can restart the game. Game Breaking
Sindbad Fa'adiyah Seer and Sindbad's ability won't discard non-land card drawn if there is any dredge card in your graveyard Advantageous
Sound the Call The art for the token created by Sound the Call is incorrect. Graphical
Sheltering Ancient [Sheltering Ancient]'s Cumulative Upkeep Stops Working After One Age Counter Advantageous
Vexing Sphinx Vexing Sphinx's Cumulative Upkeep Doesn't Make You Discard Advantageous
Commandeer Commandeer does not gain control of the targeted noncreature spell. Disadvantageous
Odds // Ends Odds restarts the game in buggy state on heads Game Breaking
Odds // Ends Odds restarts the game in buggy state on heads Game Breaking
Nullstone Gargoyle Nullstone Gargoyle functions incorrectly. Unclassified
Nullstone Gargoyle Nullstone Gargoyle counters all noncreature spells cast Advantageous
Concerted Effort Some protection abilities granted by Concerted Effort are not shown visually on creatures Graphical
Concerted Effort Some specific protections (Snow or specificially spectra ward) are not counted as protections to be gained or shared Disadvantageous
Booby Trap Booby Trap does not let you name anything other than non-basic lands. Disadvantageous
Riptide Replicator Riptide Replicator tokens use incorrect art and incorrectly display they have the changeling ability. Graphical
Death Pit Offering Death Pit Offering sacrifices all of its owner’s permanents, not just creatures Disadvantageous
Storage Matrix Storage Matrix Selecting yes to anything other than artifacts with two Storage Matrices in play causes the game to soft lock. Avoidable Game Breaking
Zur's Weirding Zur's Weirding Reveals but doesn't allow you to pay Disadvantageous
Sekki, Seasons' Guide Spirit tokens created by Sekki, Seasons' Guide are not considered to have the same name. Unclassified
Cut the Earthly Bond Spells and non-static abilities that care whether a permanent is enchanted, will see equipped permanent as enchanted Advantageous
Tomorrow, Azami's Familiar Tomorrow, Azami's Familiar puts both unchosen cards back on top of the library. Disadvantageous
Brothers Yamazaki If one player controls two Brothers Yamazaki, and another player controls one, the "legend rule" continues to not apply. Unclassified
Brothers Yamazaki The legend rule continues to not apply if you have multiple Brothers Yamazaki tokens from Helm of the Host. Advantageous
Nezumi Shortfang Kamigawa Flip cards are displayed as enchantments and do not respect the attack with all function or changes to power and toughness. Unclassified
Samurai of the Pale Curtain Samurai of the Pale Curtain does not exile tokens. Disadvantageous
Death-Mask Duplicant Some specific protections (Snow or specificially spectra ward) are not counted as protections to be gained or shared Disadvantageous
Scythe of the Wretched While Scythe of the Wretched is unequipped, it reanimates any creature that happens to die. Advantageous
Quicksilver Fountain Quicksilver Fountain allows you to place flood counters on nonland permanents. Advantageous
Shared Fate Zones that cards appear in due to the replacement ability of Shared Fate are incorrect. Graphical
Orcish Spy Orcish Spy and cards with similar abilities show the cards in alphabetical order, not the actual order Disadvantageous
Momir Vig, Simic Visionary Avatar Phyrexian Revoker can name the Momir Vig, Simic Visionary Avatar. Unclassified
Cryptic Gateway Cryptic Gateway does not let you select a card from your hand Non-Functional ability
Words of Waste Words of Waste does not function. Non-Functional ability
Compost Compost The effect isn't triggered when an opponent only casts the nonblack half of a split card. Disadvantageous
Venomous Vines Spells and non-static abilities that care whether a permanent is enchanted, will see equipped permanent as enchanted Advantageous
Holistic Wisdom Holistic Wisdom restarts the game when you activate it Game Breaking
Liquid Fire Liquid Fire doesn't let you choose how to deal damage - it all goes to player Disadvantageous
Shifty Doppelganger Shifty Doppelganger puts an "ability" onto the battlefield at end of turn, rather than itself. Game Breaking
Goblin Game Goblin Game reveals your chosen number before your opponents choose. Disadvantageous
Overabundance [Overabundance] can't add colorless mana, therefore keeping players from using lands that only tap for colorless Advantageous
Meteor Storm Meteor Storm only discards one card if you have exactly two Advantageous
Crystal Spray Cards that ask you to choose "a basic land type or a color word" only let you choose a basic land type. Disadvantageous
Withdraw Withdraw is able to target the same creature twice. Advantageous
Caller of the Hunt Caller of the Hunt doesn't allow you to pick a creature type Disadvantageous
High Seas [High Seas] only affects red creature spells. Disadvantageous
Rayne, Academy Chancellor Spells and non-static abilities that care whether a permanent is enchanted, will see equipped permanent as enchanted Advantageous
Multani's Presence Multani's Presence incorrectly draws cards off copies of spells that are countered Advantageous
Thran Turbine Thran Turbine mana is able to be used to cast spells Advantageous
Mogg Assassin Mogg Assassin doesn't kill the opponent's creature on a won flip and doesn't always let both players select a target Disadvantageous
Aether Tide Aether Tide is unable to be cast. Unclassified
Spinning Darkness You can't cast Spinning Darkness for its alternate cost Disadvantageous
Teferi's Realm Teferi’s Realm forces you to phase everything out Unconfirmed
Null Chamber [Null Chamber]'s Controller is asked to name two non-basic lands, rather than each player naming a card that's not a basic land. Advantageous

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