Gisa and Geralf is a mythic Legendary Creature — Human Wizard card from Eldritch Moon Promos (PEMN), collector number 183s. Current market price: — (foil $8.94), TCGplayer market prices via Scryfall.
When Gisa and Geralf enters, mill four cards. Once during each of your turns, you may cast a Zombie creature spell from your graveyard.