Gisela, the Broken Blade

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.
In the dawn's embrace, Gisela, the Broken Blade,
awaits the beginning of the next apocalypse.