You can’t choose to pay any additional costs for the copies. The same is true of spells that distribute counters. If the spell has damage divided as it was cast, the division can’t be changed (although the targets receiving that damage still can). If the spell that’s copied has an X whose value was determined as it was cast, the copies will have the same value of X. If the spell that’s copied is modal (that is, it says “Choose one -” or the like), the copies will have the same mode or modes. You may change any number of the targets, including all of them or none of them. The copies will have the same targets as the spell they’re copying unless you choose new ones. The copies resolve before the original spell.

Thousand-Year Storm’s ability will copy any instant or sorcery spell, not just one with targets.Ĭopies are created even if the spell that caused Thousand-Year Storm’s ability to trigger has been countered by the time that ability resolves.

If an effect instructs you to cast multiple spells, they’re cast one at a time in any order. Spells you’ve cast that were countered were still cast, and so will add copies when Thousand-Year Storm’s ability resolves for later spells in the turn.

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