Glissa, the Traitor is a mythic Legendary Creature — Phyrexian Zombie Elf card from From the Vault: Lore (V16), collector number 5. Current market price: — (foil $6.45), TCGplayer market prices via Scryfall.
First strike, deathtouch Whenever a creature an opponent controls dies, you may return target artifact card from your graveyard to your hand.