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.
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Spells cast from zones other than a player's hand and spells that were countered are counted by the storm ability.
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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.
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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.
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You may choose new targets for any of the copies. You can make different choices for each copy.
Counter target spell unless its controller pays .
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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