Gisela, the Broken Blade is a mythic Legendary Creature — Angel Horror card from Eldritch Moon (EMN), collector number 28. Current market price: $23.47 (foil $32.32), TCGplayer market prices via Scryfall.
Flying, first strike, lifelink At the beginning of your end step, if you both own and control Gisela and a creature named Bruna, the Fading Light, exile them, then meld them into Brisela, Voice of Nightmares.