
Counter target spell.
At the beginning of your next upkeep, pay {3}{U}{U}. If you don't, you lose the game.
Pact of Negation has 9 printings, first in Future Sight (2007). EDHREC ranks it #374 among Commander cards. It appears most in Kinnan, Bonder Prodigy decks (13,418 on EDHREC). It has 3 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.