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