Signoir, the Devourer

Flying, Deathtouch, Menace, Delve
When Signoir, the Devourer enters the battlefield
or attacks, target opponent discards a card.
At the beginning of each end step, if you or an opponent have one or fewer cards in hand, return
Signoir, the Devourer from your graveyard to the battlefield.
"Mortality is the illusion shared by lesser beings."
-Signoir the Devourer