Elvish Fury is a common Instant card from Modern Horizons (MH1), collector number 162. Current market price: $0.25 (foil $0.43), TCGplayer market prices via Scryfall.
Buyback {4} (You may pay an additional {4} as you cast this spell. If you do, put this card into your hand as it resolves.) Target creature gets +2/+2 until end of turn.