Pig-Head the Ravenous

Undergrowth-This creature enters the battlefield
with a +1/+1 for each creature in your graveyard.
As long as Pig-Head has three or more +1/+1
counters on it, it gains vigilamce, haste, flying,
and trample.
Whenever a creature would be put into a
graveyard, you may cast it. You may spend mana
as though it were mana of any color to cast
creature spells this way.