Nocturnal Hunger is a common Instant card from Bloomburrow (BLB), collector number 102. Current market price: $0.09 (foil $0.26), TCGplayer market prices via Scryfall.
Gift a Food (You may promise an opponent a gift as you cast this spell. If you do, they create a Food token before its other effects. It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.") Destroy target creature. If the gift wasn't promised, you lose 2 life.