Sharuum the Hegemon [Commander 2013]

Set: Commander 2013 Type: Legendary Artifact Creature — Sphinx Rarity: Mythic Cost: {3}{W}{U}{B} FlyingWhen Sharuum the Hegemon enters the battlefield, you may return target artifact card from your graveyard to the battlefield. To gain audience with the hegemon, one must bring a riddle she has not heard.