Flayer of Coffers

Mutate {2}{b}{b} (If you cast this card for its
mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on
top plus all abilities under it)
Whenever this creature mutates, you may exile
a creature from target graveyard. If you do,
create a colorless artifact Treasure token with {t}, sacrifice this artifact: Add one mana of any
color to your mana pool.