Spy Game

Write down the name of a creature card,
but don't show it to your opponent. Whenever
that card attacks, destroy a creature. At any time,
your opponent may guess the name of the
creature card. Then, show your opponent the
name of the card. If they are right, you lose the
game. If they are wrong, they lose the game.
"Hello. My name is Sussus Amogus. I'm 33 years
old."