Blood Bath

The chosen creature type(s) for blood bath are
bat, demon, devil, giant, hag, harpy, horror,
insect, leech, ogre, spider, spirit, thrull, troll,
vampire.
Every time a nonartifact creature goes to the
graveyard put 2 blood counters on blood bath.
{1}{b/r}: Add 1 blood counter to blood bath.
{2}: Remove 1 blood counter from blood bath:
Regenerate a creature of the chosen type(s) you
control. Remove all -1/-1 counters from that
creature.