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.