Razors Edge works well againist bubbles it goes under them and kills whoever it hits inside the bubble. Problem is when they have constant Golden Guns getting that close is a chore.

Ya thats the hardest part. But what if you use vanish? That could work

You can't use both Vanish and Razor's Edge because they're in the same stat tree. And using Vanish to get close and then trying to kill them all by Arc Blade Melee is damn near impossible when you have 4 guys shooting and melee-ing you that all have Armor of Light. I usually just hold down a different portion of the map and let them come to me.