Raven, The Black Retainer

Possession -{5}{u}{u},{t}, Exile Raven, take control
of target creature for as long as Raven is in exile.
Create a 1/1 black bird token with flying and 'whenever this creature dies, if Raven is in exile
return it to the battlefield tapped.
Summon-{5}{r}{r}-Sacrifice Raven, search your
library for a demon card and put onto the battlefield tapped.
"What's the matter? Afraid of the dark?"