Sauron, the ring-lord

Double strike, Trample, Menace, Vigilance
Sauron, almighty ring-lord cannot be blocked by
orcs, demons, or trolls.
When Sauron, almighty ring lord enters the battlefield, you may search your library for a card
named the ring of power. If you do, you may place
it onto the battlefield.
Whenever a demon deals combat damage to a
player, each opponent loses 1 life.