Gella, Himin's Hunger

Human offering {4}{b}{r} (You may play the
card anytime you could play an instant by sacrificing
a Human and paying the difference in mana costs
between this and the sacrificed Human. Mana
cost includes color.)
Whenever you sacrifice a permanent, add two
mana of any one color.
When Gella, Himin's Hunger deals combat
damage, scry 1, then you may have the top card
of your library gain "Human Offering {1}{b}"