Mirsae, Engaged to Vitaz

Flying, Deathtouch, Prevent all damage that
would be dealt to Mirsae, Engaged to Vitaz
When Mirsae, Engaged to Vitaz enters the battlefield, if you control Vitaz, Planar Ally exile
him. If not, you may search your library for
Vitaz, Planar Ally and exile him, then shuffle.
When you exile Vitaz, Planar Ally this way,
conjure a card named Vitaz, Promised Man into
your hand. You may not play creatures named
Engaged to Vitaz as long as you control Mirsae, Engaged to Vitaz.