Word of Judgment

As an additional cost to cast Word of Judgment, you may sacrifice a Spellstone.
If Word of Judgment's additional cost was paid, search your library for a card that shares a color with the sacrificed Spellstone's color identity and put it into your hand, then shuffle.
Exile all creatures. You may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of creatures exiled by Word of Judgment.