Fateweaver Coven

{x}{u}{u}: Look at the Xth card from the top
of your library. If its converted mana cost is X or less, cast it without paying its mana cost. Otherwise, shuffle your library and add X colorless mana to your mana pool.
Silently, the coven watched the battle. And when the time was right, their voices rang like bells: "Come. What. May."