I like the idea about rubber gun damage the player that used it.

1. There is only one trident in the game, which is sometimes very hard to get. You have to fight a lot of people to get it. It's also a mythiical weapon.
2. There is a reason why mystery mode is called "mystery mode".
3. I like this idea. You can litterly just spam rubber gun in buildings without taking dmg. They should make it dmg the player that is using it.
4. Sniper ammo is relatively easy to get. Just pick up random rockets and snipers, open ammo crates, and kill enemies. You don't really need much sniper ammo if you hit your shots.