Gisela, the Broken Blade [From the Vault: Transform]

Flying, first strike, lifelink
At the beginning of your end step, if you both own and control Gisela, the Broken Blade and a creature named Bruna, the Fading Light, exile them, then meld them into Brisela, Voice of Nightmares.

Meld Partner: Bruna, the Fading Light
When Melded, it becomes the following:

Brisela, Voice of Nightmares
Legendary Creature — Eldrazi Angel (9/10)
Flying, first strike, vigilance, lifelink
Your opponents can't cast spells with converted mana cost 3 or less