Gisela, the Broken Blade is a mythic Legendary Creature — Angel Horror card from Secret Lair Drop (SLD), collector number 1387. Current market price: $29.02, 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.