Field of Slaughter

(As a Contest enters, choose an opponent. That
opponent gains control of it.)

{t}: Add one mana of any color and clash with an opponent. (Each clashing player reveals the top card
of their library, then puts that card on the top or
bottom. A player wins if their card had a higher
mana value.)
If you lose, that opponent gains control of
it and its owner creates a 1/1 black and red skeleton
creature token.