Annatar, Lord of Gifts

When Annatar, Lord of Gifts enters the
battlefield each opponent creates a colorless
legendary Ring of Power token with shroud and
indestructible and "At the beginning of your end
step put a corruption counter on Ring of Power,
if there are 5 or more corruption counters on
Ring of Power you lose the game.'
"A mask he still could wear so that if he wished he
might deceive the eyes of Men, seeming to them
wise and fair."