Show of Confidence is a uncommon Instant card from Strixhaven: School of Mages (STX), collector number 28. Current market price: $0.17 (foil $0.26), TCGplayer market prices via Scryfall.
When you cast this spell, copy it for each other instant and sorcery spell you've cast this turn. You may choose new targets for the copies. Put a +1/+1 counter on target creature. It gains vigilance until end of turn.