Tend the Pests is a uncommon Instant card from Strixhaven: School of Mages (STX), collector number 242. Current market price: $0.52 (foil $0.92), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, sacrifice a creature. Create X 1/1 black and green Pest creature tokens with "When this token dies, you gain 1 life," where X is the sacrificed creature's power.