Zariel, the Fallen

Flying, First Strike, Lifelink
Whenever Zariel, the Fallen kills a creature,
put that creature onto the battlefield from its
owner's graveyard under your control at the beginning of the next end step.
"The clawing of devilish hands was enough to break
the remaining shred of loyalty in Zariel, and she joined
in with the chorus of screams from below." -
The Epic of Zariel