Harold, The Eradicator

Whenever Harold enters the field, inform all opponents that you will now leave the room
and while you are gone, they must deliberate and secretly select an existing creature you don't
control. Do not reveal what the rest of this card
says. Take this card with you. When you return,
you must figure out which creature they chose
within three guesses, if you do, exile it, if
not, lose 2 life.
{2}{u}{u}{b}, Exile Harold: Return this card to your
hand during the next end step.