Requires

Eye of the Storm must be on the battlefield. Spellshift must be in hand. You have an additional instant or sorcery card in hand. Mana needed: plus enough mana to cast the additional instant or sorcery

Steps

1. Cast the additional instant or sorcery by paying its mana cost, triggering Eye of the Storm.
2. Holding priority, cast Spellshift by paying targeting the instant or sorcery spell.
3. Eye of the Storm triggers, exiling Spellshift and casting copies of Spellshift and any other instants and/or sorceries exiled by Eye of the Storm of your choosing without paying their mana costs.
4. Choose to have Spellshift target any instant or sorcery spell on the stack of your choosing.
5. Resolve Spellshift, countering the chosen instant or sorcery spell and then revealing an instant or sorcery card from your library, cast it without paying its mana cost, and shuffle your library.
6. Eye of the Storm triggers, exiling the instant or sorcery and casting copies of Spellshift and any other instants and/or sorceries exiled by Eye of the Storm of your choosing without paying their mana costs.
7. Repeat from step 4.

Results