Word of Disdain

As an additional cost to cast Word of Disdain, you may sacrifice a Spellstone.
If Word of Disdain'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.
Counter target spell. You may cast a spell with an equal or lesser mana value from your hand without paying its mana cost.