Same but mine is a rogue. Here's the build.
Yes it does use frozen like the Frozen Throne Orb Build but it's a rogue with far more MH% DMG as well as PermaStealth and coat. It can do ridiculous damage in ice form and in any form at all, even arcane.
Mirror Image and Orb is good actually but no reactor will come out. Why? Reactor only works on MH damage and orb from Mirror Image is OH damage.
Not to mention Mirror Image has incredibly low DMG! If you're a rogue, you'd get slightly better mirror image at mirror image 20 due to hero points for 200% instead of 100% OH DMG. With push the Limit, up to 300% or 400% OH which will make Mirror image orb do similar damage to normal orb. But at hero point 40, you'd be getting 450% to 600% OH DMG mirror image if you use 1 or 2 PTL. I mean 600% OH isn't too bad tbh and that's similar to wizard 600% from discordance MH% but for rogue. If you use Swap+Mirror Image, up to 1800% OH Mirror Image which is actually pretty good. Not as good as 4000% MH as you get on rogue but a very high Offhand DMG % along with the hit frequency.
If swap at hero points 20, even better. It's official, I could make a Orb Mirror Image rogue build with swap for the fun of it, even though it may be useless. Takes a bit of slots to really make Mirror Image do worthwhile DMG with any skill and best for rogue.
But Orb can get incredible MH% DMG to 1000s and sometimes even 4000% MH for rogue orb. If only offhand could do that lol. Also my reactor is very high MH DMG due to initial MH%. Obviously my build uses discordance.
But if you use another class, mirror image can be boosted by Identity Set. With Identity and 1 Push the Limit or 2, you'd be getting 243.75% OH DMG. Not much OH damage from Mirror image so any skill will barley do damage. Orb is still good with that though due to hit frequency but you can get so much higher orb MH% and the reactor as a bonus.
Although if you use the +all skills affix on other class, you'd be increasing Mirror Image OH% to 365.625% OH.
Another thing is that on rogue, Mirror Image is a summon object so whenever you increase hero points, you can increase its Summon DMG along with its OH% DMG.
I think your mirror image orb build (whether it's rogue or other class will actually deal good DMG even if it's not the most efficient).
Although it's a good thing you can have multiple mirror images.