Omnivorous Avarice

Whenever a nontoken creature you control
dies, create a tapped Treasure token.
Once during each of your turns, you may cast a
creature spell from your graveyard. Spend only
mana produced by Treasures to do so.
"All is naught in these voracious pits, unending desire spilling out from greedy innards, only to be consumed
again."
—The Book of Sin