Devouring Rage is a common Instant — Arcane card from Champions of Kamigawa (CHK), collector number 164. Current market price: $0.14 (foil $0.25), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, you may sacrifice any number of Spirits. Target creature gets +3/+0 until end of turn. For each Spirit sacrificed this way, that creature gets an additional +3/+0 until end of turn.