Flusterstorm
Counter target instant or sorcery spell unless its controller pays {1}. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)
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Official rulings (5) · Scryfall
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.
You may choose new targets for any of the copies. You can make different choices for each copy.
The triggered ability that creates the copies can itself be countered by anything that can counter a triggered ability. If it is countered, no copies will be put onto the stack.
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.
Spells cast from zones other than a player's hand and spells that were countered are counted by the storm ability.