Faerie Fencing is a uncommon Instant card from Wilds of Eldraine (WOE), collector number 90. Current market price: $0.33 (foil $0.32), TCGplayer market prices via Scryfall.
Target creature gets -X/-X until end of turn. That creature gets an additional -3/-3 until end of turn if you controlled a Faerie as you cast this spell.