Devan Lexi, Void Mage

When this card destroys a creature, Exile it
instead. When a card would be exiled, put a
void counter on it for each card exiled. When
this card has 10 or more void counters on it,
you can remove 10 void counters and exile all
permanence your opponent controls, then
sacrifice this card and put Devan Lexi onto the
battlefield under your control from outside
the game.