This isn't too fancy of a gamemode. Every hero has three passives. Some of these are passive passives (like Mercy's Regeneration passive in the base game), while some are more interactive passives (like Genji's Cyber-Agility passive in the base game). There are several other additions as well. It goes by Competitive rules. I made this out of spite and to prove that I can balance the game better than the Overwatch team.
Thanks, and have fun.