Rescue Retriever

• WOTC Official Reminder Textofficial rules
  Flash — You may cast this spell any time you could cast an instant.

• WWizards of the Coast2022-10-14
  Official Ruling
  If Rescue Retriever leaves the battlefield before combat damage is dealt to your other attacking Soldiers, they will take damage as normal. Notably, this means it is usually a bad idea to attack with Rescue Retriever if your opponent could block it with a creature that has first strike and enough power to kill it.
• WWizards of the Coast2022-10-14
  Official Ruling
  Rescue Retriever prevents damage to other attacking Soldiers even if it isn't also attacking.

Rulings via Scryfall