Cyclossirox, Gorging Overlord

Double strike, trample, reach, indestructible, menace
When Cyclossirox, Gorging Overlord enters the battlefield, Put 10 +1/+1 counters on another target demon.
Cyclossirox, Gorging Overlord would be put into
a graveyard from anywhere, shuffle all cards you own from exile and all cards in your graveyard into your library. Then, return Cyclossirox, Gorging Overlord to your hand.