Frank Fontaine

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, insteadexile 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.