Rot Feeder

{b}{g}, {t}: Exile target creature card from a graveyard, put X +1/+1 counters on Rot Feeder where X is the exiled creature's toughness.
When Rot Feeder is put into the graveyard, target player loses life equal to the number of +1/+1 counters on Rot Feeder.
Its hunger knows no end, what it consumes only makes it stronger.