Old Agatha Bonesnapper

Foul (At the beginning of your upkeep, put a -1/-1 counter on this creature. Whenever this creature is blocked by a creature, move a -1/-1 counter from this creature onto that creature.)
Whenever Old Agatha Bonesnapper blocks a creature, put a -1/-1 counter on Agatha.
Tales tell of an old hag who lives in the swamps surrounding Rodrickton, who takes extra pleasure in leading children to their deaths.