Colvin the Necromancer

Whenever a creature you control dies, create a 2/2
black zombie creature token with deceased(When
that card is put in the graveyard from anywhere,
instead exile it).
{1}{b}{b}{b}, Sacrifice a creature: Create X 2/2 black
zombie creature with deceased, where X is the
sacrificed creatures mana cost or power.
Leave the dead alone? Ha! You can do that.