I had a few request from yesterday to show off my build so I made a quick video. I also forgot to turn on RF while fighting sirus which would've been 40% more dmg, but as you can see the dmg is still high without it and for any other boss the dps is 5x higher because of spark bouncing off walls, sirus is the only boss without walls to bounce off of.

Obviously this is still just a herald stacking build so nothing special, but this is what you can achieve when you have a load of currency and can make use of skills that tend to have less dps but great aoe coverage, like spark. Which in my opinion just has the best clear speed for maps with a good layout. Spark is also amazing for beyond compared to other herald stacking skills, as you can see in the end there is only about 20~ mobs remaining.

I have 174% proj speed, 5 second spark duration, 6.4k es regen/second and 84% flat physical reduction (not counting armor).

PoB: https://pastebin.com/1NFG3jBV

A "budget" version would probably cost around 200-300ex~, I wouldn't recommend playing spark with less then that just because you really need the gear to make the dmg feel good relative to other herald stacking builds. While I'm sure it's doable something like EK would probably just feel/play a whole lot better on a 50ex~ budget.