Devourer of Sin

Human Offering (You may cast this spell any time you could cast an instant by sacrificing a Human and paying the difference in mana costs between this and the sacrificed Human. Mana cost includes color.)
Trample
If you reduced Devourer of Sin's mana cost by sacrificing a Human, put a number of +1/+1 counters on Devour of Sin, equal to the amount of mana reduced.