Oops! I Win!

Oops! I Win! must be a printed paper proxy that is placed in front of a basic land within your deck.

If Oops! I Win! is the first card you draw during your draw step, reveal it. Play this card.

When Oops! I Win! enters the battlefield, if it was revealed, declare you have accidentally won the game. If all opponents unanimously agree, you win. Otherwise, remove this proxy. It becomes the basic land behind it.