Will, Scion of Peace is a mythic Legendary Creature — Human Wizard card from Wilds of Eldraine (WOE), collector number 218. Current market price: $0.88 (foil $1.75), TCGplayer market prices via Scryfall.
Vigilance {T}: Spells you cast this turn that are white and/or blue cost {X} less to cast, where X is the amount of life you gained this turn. Activate only as a sorcery.