Alpha Brawl

• WWizards of the Coast2011-01-22
  Official Ruling
  The damage dealt by the targeted creature is not divided in any way. For example, if a 3/3 creature is targeted, it will deal 3 damage to each other creature controlled by its controller.
• WWizards of the Coast2011-01-22
  Official Ruling
  None of the damage dealt due to Alpha Brawl is combat damage.
• WWizards of the Coast2011-01-22
  Official Ruling
  Abilities like lifelink and deathtouch that care about any kind of damage are taken into account.
• WWizards of the Coast2011-01-22
  Official Ruling
  If the targeted creature has infect or wither, the damage it deals will result in -1/-1 counters being put on each creature it deals damage to. The power of those creatures will be reduced when they deal damage back to the targeted creature.
• WWizards of the Coast2011-01-22
  Official Ruling
  The two parts of Alpha Brawl’s effect happen sequentially: first the targeted creature deals damage, then the other creatures deal damage. State-based actions aren’t checked in the middle, so creatures that are dealt lethal damage by the targeted creature will still deal damage.
• WWizards of the Coast2011-01-22
  Official Ruling
  Combat abilities like first strike, double strike, and trample don’t apply and will have no impact on Alpha Brawl’s effect.

Rulings via Scryfall