Killian's Confidence (#197)

Type: Sorcery

Text: 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.

"Don't hold back, because I certainly won't."

Set: Secrets of Strixhaven (#197)