Blind Divination

When Blind Divination enters the battlefield,
discard your hand. Exile the top seven cards of
your library face down.
(you may not look at cards exiled this way)
Reveal a facedown exiled card : until end of turn,
you may play the revealed card.
{w}{w}{u}{u}{r}{r}: Exile Blind Divination, then
return it to the battlefield.