Personally I would have a 1v1 arena based mode. No supers and minimal ammo spawns to force a fight. Would be cool to add some unique map design so hazards would occur during the game. Totally environmental, aswell as random scorch cannon spawns. And buffs spawning throughout the map to fight over that would net armour boosts, double damage ect. It would also be cool if this mode looted a random exotic engram for a 10 win streak. Aswell as a emblem and access to a special vendor who sells items dependant on players rank within the crucible.