Cho'Gath, Terror of the Void

Trample, Menace, Devour 1 (As this creature comes into play, you may sacrifice any number of creatures. This creature comes into play with that many +1/+1 counters on it.)
When you cast this spell, you may sacrifice any number of mono-colored permanents. For each permanent sacrificed in this way, this spell's mana cost is reduced by 1.