Bonnie, Once Scarred

Wither (This deals damage to creatures in the form of -1/-1 counters.)

{w/b}{w/b}{b},{t}: Bonnie, Once Scarred can move a counter off of target creature and place it on another target creature. Activate only as a sorcery.

Cretures with counters on them placed there by Bonnie have, "At the beginning of the your end step, lose 2 life or sacrifice this creature."
You may cast Bonnie from your graveyard as long as a creature you don't control has a counter on it.