Theon, Prince of Fools

At the end of your turn, if you control Theon, Prince of Fools, you must spend either {2} or
lose 1 life.

{t}{1}{u}{b}: Target opponent gains control of Theon, Prince of Fools until the end of their
next turn. Theon, Prince of Fools doesn't
untap during their next untap step.