Rowan, Scion of War is a mythic Legendary Creature — Human Wizard card from Wilds of Eldraine (WOE), collector number 300. Current market price: $2.26 (foil $9.44), TCGplayer market prices via Scryfall.
Menace {T}: Spells you cast this turn that are black and/or red cost {X} less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery.