Seito of the Falling Sky

Flying, vigilance, first strike
When you cast Seito of the Falling Sky you may
exile it. If you do, create a black 4/4 Bird token
with flying and "When this creature dies return
Seito of the Falling Sky from exile to the battlefield."
{w}{u}{r}: Exile Seito of the Falling Sky, create a
black 4/4 Bird token with flying and "When this
creature dies return Seito of the Falling Sky from exile
to the battlefield."