Quote from RasAlgethi24Hey thanks, interesting build. I'll give it a shot later.
Only problem I see is it would be horrible against elites without trash mobs around. If you're farming, you'd want to get the 5 stacks first before heading to FoM so I can see that being a problem.
Most people stack to 5 in Festering Woods. The two crypts there with the elite in them both have trash mobs inside to help. And outside of those crypts there are plenty of trash mobs to help with the elites in the general Festering Woods area.
However, I do see your concern, because sometimes you're not able to kill the elite pack before all the trash is dead. Out in the game world you can always re-kite to more trash, but inside of a cave or crypt you don't always have that option. To help remedy this, you can always replace Blizzard or Teleport with something better suited for elite fights without trash mobs around. What I used to do was use Arcane Mines in place of Blizzard. AM can be used to pull mobs like Blizzard (not as effective, but it does work), and it works extremely well for taking out elite packs, especially when combined with CM + EB + DS + SA due to it's very high proc coefficient.
Another good thing about using Arcane Mines in the build is for the initial "wind up". What you'd do is cast Frost Nova, then cast a couple of Arcane Mines at the mobs, then start holding down Black Ice and mashing Chain Reaction and Diamond Shards. The Mines will help with getting that initial killing blow, and since they do a lot of damage the healing helps keep you up a little bit once Frost Nova wears off. If all the trash dies and the elites are still around, then you just swap over to AM + EB + DS + SA. My older Black Ice video shows this:
Another idea I'm mulling over is to use Archon: Arcane Destruction in place of Frost Nova. This is to be used only after the dust settles and elites are still alive. You'd just pop Arcane Destruction to finish the elites off. The explosion + the 15 second Archon duration should be enough to mop them up. And because you get soooo many CM procs from the trash, it should always be available for every elite pack should you need it. The only problem with this is that you'd need to run with really high eHP because you won't have that "free" 2-3 second window that Frost Nova provides when going for the initial killing blow(s). If this is a problem, you can always replace Blizzard or Teleport instead.
I hope that helps address some of your concerns. The build and its variations take a bit of getting used to in order to truely maximize because they play a bit differently than what most of us are used to. Once you get it down, though, it can be quite devastating.