Planar Chaos

Spellshift

Counter target instant or sorcery spell. Its controller reveals cards from the top of his or her library until he or she reveals an instant or sorcery card. That player may play that card without paying its mana cost. Then he or she shuffles his or her library.

Counter target instant or sorcery spell. Its controller reveals cards from the top of their library until they reveal an instant or sorcery card. That player may cast that card without paying its mana cost. Then the player shuffles.