Leu, Sovereign of Corvine Veil

Flying, Hexproof and Protection From White

At the beginning of your end step, you may exile target creature you control. If you do, create a 1/1 black Bird creature token with flying named Veilbound Raven. It has " {2}, Sacrifice this creature: Return the exiled card to the battlefield transformed under your control.”

Whenever a Bird you control dies, you may glimpse 1 and lose 1 life.