In round one of an event I am playing with thief of sanity. I hit my opponent and get the trigger in the third game of the match. We are using the same sleeves so I don't notice that I accidentally shuffled their cards into my deck at the end of the game. Several turns into the next round I notice I have their cards in my deck somehow. What is the policy for resolving this?
Private Mod Note
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And on that day, Garfield said unto the world "Go ye forth and durdle!"
Assuming this is at Regular REL, here is the rule from the JAR:
A player has illegal, insufficient, or another player’s cards in his or her deck Remove any cards that shouldn’t be in the deck, put back any cards that should, then add basic lands of the player’s choice if the deck is below the format's minimum size limit. Any cards that are added to the deck should be shuffled directly into the library. If the error was discovered during a draw effect, have the player complete the draw effect after the deck is fixed and shuffled. Encourage players to count their deck and present their sideboard (face down) to their opponents before starting a game to avoid these errors.
Assuming this is at Regular REL, here is the rule from the JAR:
A player has illegal, insufficient, or another player’s cards in his or her deck Remove any cards that shouldn’t be in the deck, put back any cards that should, then add basic lands of the player’s choice if the deck is below the format's minimum size limit. Any cards that are added to the deck should be shuffled directly into the library. If the error was discovered during a draw effect, have the player complete the draw effect after the deck is fixed and shuffled. Encourage players to count their deck and present their sideboard (face down) to their opponents before starting a game to avoid these errors.
Ok cool. What if this was at Comp REL and what would happen to my opponent when they notice in the middle of their next match that I probably have their cards in my deck? Would that change anything?
Private Mod Note
():
Rollback Post to RevisionRollBack
And on that day, Garfield said unto the world "Go ye forth and durdle!"
It ends up being a Deck problem and is covered in the IPG:
Players are expected to call attention to deck errors immediately, and not gain any potential advantage from having the cards in their deck.
The most common forms of deck error are failure to desideboard and having a card in the wrong deck. Both of these are difficult to gain advantage from without obvious cheating. Denying them the card that they would have otherwise be working with is sufficient to compensate for the easily discovered situations.
Remove any incorrect cards from the deck, including any sideboard cards that could not yet legally have been added. Locate any cards missing from the deck and shuffle them into the randomized portion of the deck.
If the error is discovered during opening hands, instruct the player to mulligan. Otherwise, do not replace discovered erroneous cards in hands or other sets (such as a group of cards being scried or drawn). If the missing card(s) were in a previous or current opponent’s deck, issue penalties to both players.
The last comment is important to call out as it does show that both players receive a warning for having deck problems.
It is also worth calling out that deck problems potentially have an upgrade path of a game loss to dissuade cheating. One Upgrade path exempts this scenario from an upgrade to a game loss, but it appears that this would still apply:
If an incorrect card in the deck or hand becomes visible to an opponent (for example due to it being revealed or put into a graveyard) or is discovered by a judge during a deck check, the penalty is a Game Loss. This upgrade still applies if a player calls a judge with an effect on the stack or resolving that might cause the card to become visible
Basically, what that means is that if you notice it, you need to bring it to the attention of the Judge immediately so they can provide the fix and warning above. Ignoring it can lead to a game loss.
Ok cool. What if this was at Comp REL and what would happen to my opponent when they notice in the middle of their next match that I probably have their cards in my deck? Would that change anything?
The most common forms of deck error are failure to desideboard and having a card in the wrong deck. Both of these are difficult to gain advantage from without obvious cheating. Denying them the card that they would have otherwise be working with is sufficient to compensate for the easily discovered situations.
Remove any incorrect cards from the deck, including any sideboard cards that could not yet legally have been added. Locate any cards missing from the deck and shuffle them into the randomized portion of the deck.
If the error is discovered during opening hands, instruct the player to mulligan. Otherwise, do not replace discovered erroneous cards in hands or other sets (such as a group of cards being scried or drawn). If the missing card(s) were in a previous or current opponent’s deck, issue penalties to both players.
The last comment is important to call out as it does show that both players receive a warning for having deck problems.
It is also worth calling out that deck problems potentially have an upgrade path of a game loss to dissuade cheating. One Upgrade path exempts this scenario from an upgrade to a game loss, but it appears that this would still apply:
Basically, what that means is that if you notice it, you need to bring it to the attention of the Judge immediately so they can provide the fix and warning above. Ignoring it can lead to a game loss.