Chatterstorm

If a spell with storm has targets, you may choose new targets for any of the copies. You can make different choices for each copy.

The copies are put directly onto the stack. They aren't cast and won't be counted by other spells with storm cast later in the turn.

A copy of a spell can be countered like any other spell, but it must be countered individually. Countering a spell with storm won't affect the copies.