Obzedat, Ghost Council is a mythic Legendary Creature — Spirit Advisor card from Gatecrash (GTC), collector number 182. Current market price: $1.05 (foil $8.34), TCGplayer market prices via Scryfall.
When Obzedat enters, target opponent loses 2 life and you gain 2 life. At the beginning of your end step, you may exile Obzedat. If you do, return it to the battlefield under its owner's control at the beginning of your next upkeep. It gains haste.