Satan's True Prophet

When Satan's True Prophet enters the battlefield, create an artifact named Satanic Bible with: "{t}: Target creature becomes a demon."
It enters the battlefield tapped.
{2}, {t}: Gain control of target demon for as long
as you control Satan's True Prophet.
As long as you control five or more other demons, Satan's True Prophet has hexproof.
The real, biblical Satan is not at all what you
probably think of.