Beaming Defiance is a common Instant card from Strixhaven: School of Mages (STX), collector number 9. Current market price: $0.14 (foil $0.20), TCGplayer market prices via Scryfall.
Target creature you control gets +2/+2 and gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)