Kess, Dissident Mage is a mythic Legendary Creature — Human Wizard card from Modern Horizons (MH1), collector number 206. Current market price: $3.81 (foil $11.14), TCGplayer market prices via Scryfall.
Flying Once during each of your turns, you may cast an instant or sorcery spell from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead.