Agatha's Champion is a uncommon Creature — Human Knight card from Wilds of Eldraine (WOE), collector number 160. Current market price: $0.12 (foil $0.15), TCGplayer market prices via Scryfall.
Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) Trample When this creature enters, if it was bargained, it fights up to one target creature you don't control. (Each deals damage equal to its power to the other.)