King Of Thralls

Trample
When King Of Thralls Enters the battlefield,
return a creature from your graveyard to the battlefield.
At the beginning of your upkeep if you control
both Nicol Bolas, Defeated and King Of Thralls,
exile them, then meld to them into Nicol Bolas,
Host of the King.
Partner with Nicol Bolas, Defeated 9/9>
Demons are always willing to make a deal.