Rockwell

Reach
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
{b}{1}: Put a -1/-1 counter on a target non-black creature, if destroyed by -1/-1 counters the creatures color becomes black.
{b}{b}{b}{2}: Choose any black creature from a graveyard and put it onto the field under your control.