Shattering Spree

• WWizards of the Coast2024-01-12
  Official Ruling
  As the replicate triggered ability resolves, you'll copy Shattering Spree for each time you paid its replicate cost, even if the original spell is no longer on the stack at that time (perhaps because it was countered).
• WWizards of the Coast2024-01-12
  Official Ruling
  The copies that replicate creates are created on the stack, so they're not "cast." Abilities that trigger when a player casts a spell won't trigger.

Rulings via Scryfall