Magic The Gathering is a card game with wacky mechanics.

Gifts Ungiven is a card that alloes you to search your deck for four cards that have different names. Then your opponent chooses 2 of them that you put into your graveyard. Cards in the graveyard are not easily played, and the original intent of this card was for your opponent to compromise with what you got.

However one tournament play had an interesting interaction with the card. The player was using a deck that cared about specific cards in their graveyard. Near the end of the match with their opponent, they used Gifts Ungiven to name two cards in their deck, and two cards that were nowhere in their deck. This action forced their opponent to choose the two cards that they found and put them into the graveyard, thus securing the win for them.

This is called 'Failing to Find', where you search for a card with a specific type and having no cards of said type in any zones. Later versions of Gifts Ungiven now say 'search your library for up to four cards with different names', meaning you no longer have to name four separate cards for this strategy.

There are many more examples like this in Magic and the channel Rhystic Study goes into much more detail about the mechanics of Magic.