Elemental Eruption

• WOTC Official Reminder Textofficial rules
  Storm — When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.

• WWizards of the Coast2024-04-12
  Official Ruling
  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.
• WWizards of the Coast2024-04-12
  Official Ruling
  Spells cast from zones other than a player’s hand and spells that were countered or otherwise failed to resolve are counted by the storm ability.
• WWizards of the Coast2024-04-12
  Official Ruling
  The copies of Elemental Eruption created by its storm ability 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.

Rulings via Scryfall