Pelakka, Deathly Paradise

Pelakka, Deathly Paradise enters the battlefield
tapped.
{t}: Add {b}.
Whenever a creature you control dies, if it didn't
have a -1/-1 counter on it, exile it. You may cast
it from exile any time you could cast an instant.
When you do, it enters the battlefield with a
-1/-1 counter on it.