Reflector Mage is a uncommon Creature — Human Wizard card from Oath of the Gatewatch (OGW), collector number 157. Current market price: $0.34 (foil $2.80), TCGplayer market prices via Scryfall.
When this creature enters, return target creature an opponent controls to its owner's hand. That creature's owner can't cast spells with the same name as that creature until your next turn.