Karlov of the Ghost Council is a mythic Legendary Creature — Spirit Advisor card from Commander 2015 (C15), collector number 46. Current market price: $13.02, TCGplayer market prices via Scryfall.
Whenever you gain life, put two +1/+1 counters on Karlov. {W}{B}, Remove six +1/+1 counters from Karlov: Exile target creature.