Can of Whoop-Ass

When Can of Whoop-Ass enters the battlefield,
choose a player. That player becomes a Fool for
the rest of the game.
{5},{t}: Target Fool loses life equal to
their current life total. This loss of life cannot be prevented. Activate only if you attacked with creatures with total power of 12 or greater this turn.
Before you ask, yes, this is a Markiplier reference.