Aurelia, the Warleader is a mythic Legendary Creature — Angel card from Gatecrash (GTC), collector number 143. Current market price: $7.46 (foil $32.12), TCGplayer market prices via Scryfall.
Flying, vigilance, haste Whenever Aurelia attacks for the first time each turn, untap all creatures you control. After this phase, there is an additional combat phase.