Massive Maggot

As an additional cost to cast this spell, exile any
number of cards from graveyards. Massive
Maggot enters the battlefield with a +1/+1
counter on it for each creature card exiled with it
this way.
Scavenge {b}{g}{g} ({b}{g}{g}, Exile this card from
your graveyard: Put a number of +1/+1 counters
equal to this card's power on target creature. Scavenge
only as a sorcery)