Killian's Confidence is a uncommon Sorcery card from Secrets of Strixhaven (SOS), collector number 197. Current market price: $0.19 (foil $0.32), TCGplayer market prices via Scryfall.
Target creature gets +1/+1 until end of turn. Draw a card. Whenever one or more creatures you control deal combat damage to a player, you may pay {W/B}. If you do, return this card from your graveyard to your hand.