Unbidden Pact

Target creature gains indestructible. At the beginning of its owner's end step, you gain control
of it. At the beginning of your end step, return it to its owner's control. If Unbidden Pact or the target creature leaves the battlefield, exile both.

"I can offer you much, frail mortal. Life unending, power beyond your own pathetic means. Dissent is not an option."