Soul of Extinction

{b}{1}: Put a -1/-1 counter on target creature
{b}{3}: sacrifice a creature, then destroy target creature
Whenever a creature dies draw a card, then put a +1/+1 counter on this card.
Remove X +1/+1 counters from this card: return X cretures from your graveyard to the battlefeild. They gain Haste. Exile them at the end of this turn.