Back for More is a uncommon Instant card from Ikoria: Lair of Behemoths (IKO), collector number 177. Current market price: $0.26 (foil $0.36), TCGplayer market prices via Scryfall.
Return target creature card from your graveyard to the battlefield. When you do, it fights up to one target creature you don't control. (Each deals damage equal to its power to the other.)