Your characters have +2 Attack if you start with three Evil characters and +2 Health if you start with three Good characters.
As of patch 63.4, Fallen Angel’s buff is determined at the start of the brawl and applies throughout the brawl – so if in place at the start, it will affect summoned characters. The wording should really say “at least” three Good/Evil characters, but there’s no room left on the card! The buff does not stack, so there’s no additional advantage in having (say) six Good characters.
Game Update History
0.63.4, October 2021: Text changed from: “Your characters have +2 Attack if you have three Evil characters and +2 Health if you have three Good characters.”
Patch 62.3, September 2021: Moved to standard Advanced Hero pool instead of being restricted to slot 4
Early Access Patch 61.1: First introduced
List Of Heroes