Unprecedented Chaos

Exile target permanent. It's controller
reveals cards from the top of their library
until they reveal a non-land card. That
player may cast that spell without paying
it's mana cost. Put the revealed cards on
the bottom of their library in a random
order.
Upwards? Downwards? Laterally? Who knows!
(I sure hope I do since my OB final is in 2 days)