Devouring Greed is a common Sorcery — Arcane card from Champions of Kamigawa (CHK), collector number 110. Current market price: $0.18 (foil $1.00), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, you may sacrifice any number of Spirits. Target player loses 2 life plus 2 life for each Spirit sacrificed this way. You gain that much life.