Spellshift

Instant    (CMC:4)

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 cast that card without paying its mana cost. Then he or she shuffles his or her library.

47 PLC • ENStephen Tappin

™ & © 1993—2007 Wizards of the Coast

Legal in: Modern,Time Spiral Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Spellshift {3}{U} Instant 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 cast that card without paying its mana cost. Then he or she shuffles his or her library.

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View this MTG card on Gatherer

2/1/2007
If the targeted spell can't be countered, it remains on the stack and the rest of Spellshift's effect continues to happen.
2/1/2007
If the revealed instant or sorcery card isn't cast, it gets shuffled back into the library.
2/1/2007
If there are no instant or sorcery cards in the player's library, the entire library is revealed and then shuffled.

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Card Spellshift is not on TCGPlayer.