Firemane Avenger

• WWizards of the Coast2013-01-24
  Official Ruling
  If Firemane Avenger's battalion ability resolves but some or all of the damage is prevented, you'll still gain 3 life.
• WWizards of the Coast2013-01-24
  Official Ruling
  If the target permanent or player is an illegal target when Firemane Avenger's battalion ability tries to resolve, the ability won't resolve and none of its effects will happen. You won't gain life.
• WWizards of the Coast2013-04-15
  Official Ruling
  Once a battalion ability has triggered, it doesn't matter how many creatures are still attacking when that ability resolves.
• WWizards of the Coast2013-04-15
  Official Ruling
  The effects of battalion abilities vary from card to card. Read each card carefully.
• WWizards of the Coast2024-01-12
  Official Ruling
  The three attacking creatures don't have to be attacking the same player, planeswalker, or battle.

Rulings via Scryfall