Dauthi Voidwalker

Shadow (This creature can block or be blocked by
only creatures with shadow.)

If a card would be put into an opponent's
graveyard from anywhere, instead exile it with a
void counter on it.
{t}, Sacrifice Dauthi Voidwalker: Choose an exiled card an
opponent owns with a void
counter on it. You may play it this turn without
paying its mana cost.