Thousand-Year Storm

Copies are created even if the spell that caused Thousand-Year Storm's ability to trigger has been countered by the time that ability resolves. The copies resolve before the original spell.

The copies will have the same targets as the spell they're copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. The new targets must be legal.

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.

You can't choose to pay any additional costs for the copies. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.

Thousand-Year Storm's ability will copy any instant or sorcery spell, not just one with targets.

If the spell has damage divided as it was cast, the division can't be changed (although the targets receiving that damage still can). The same is true of spells that distribute counters.