What Pumpkin

Whenever What Pumpkin is targeted by a
spell or ability, flip a coin.
If the coin lands tails, counter the spell or
ability and exile What Pumpkin until end
of turn. Return it to the battlefield tapped
under a random player's control.
{x}, {t}: Sacrifice target What Pumpkin you
control. You gain X life.
You are quite certain there is no pumpkin.