Ghoulcaller Gisa is a mythic Legendary Creature — Human Wizard card from Commander Collection: Black (CC2), collector number 2. Current market price: $4.52 (foil $5.51), TCGplayer market prices via Scryfall.
{B}, {T}, Sacrifice another creature: Create X 2/2 black Zombie creature tokens, where X is the sacrificed creature's power.