Blind Beggars Right Ring

Hexproof, Indestructible.
You may put any exiled face down card onto
the battlefield face down, it gains "when this
card enters the battlefield, flip face up. You
must cast it if able. If its a land card, put it
onto the battlefield." (Any player may use
this ability once per turn any time they
could cast a sorcery. Spells that can be legally
cast, but can not payed for, go to exile)