Viktor, The Herald

When Viktor, the Herald enters, look at the top X cards of your library, where X is your devotion to black. 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 {b} in the mana costs of permanents you control counts toward your devotion to blue.)

"Two sides of the same coin, intractably bound. That which inspires us to our greatest good is also the cause