Thassa's Oracle

When Thassa's Oracle enters, look at the top
X cards of your library, where X is your
devotion to blue. Put up to one of them on top
of your library and the rest on the bottom of
your library in a random order. If X is
greater than or equal to the number of cards
in your library, you win the game.

(Each {u} in the mana costs of permanents you
control counts toward your devotion to blue.)