Detzerek, Soul Merchant

Whenever a creature dies or a creature card is put
into a graveyard, put a +1/+1 counter on Detzerek, Soul Merchant.
Sacrifice two creatures: Search your library for a creature card and put it onto the battlefield.
Sacrifice a creature: Add {b}{b}{b}.
Discard two creature cards cards: Destroy target
creature an opponent controls.
Discard a creature card: Draw a card.