Stormchaser Mage is a uncommon Creature — Human Wizard card from Oath of the Gatewatch (OGW), collector number 159. Current market price: $0.28 (foil $0.79), TCGplayer market prices via Scryfall.
Flying, haste Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)