Thassa's Oracle

Creature — Merfolk Wizard{U}{U}1/3

When this creature 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.)

Colour identity Blue

In short

Thassa's Oracle has 6 listed printings; the most valuable is the Secret Lair printing from SLD at US$115.53 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.