A solid build someone else shared with me that helped complete some of the last few nightmare rifts. In our team of 4, we had 1 tank and 3 of us using this build. The multizapper is in the rightmost slot (the gadget that the portable portal repeats). Snow globe and pepper spray are interchangeable; use whatever you're more comfortable with. Echo ring and pulse ring are also interchangeable because those rings have the same expected damage output over time.

We used this build specifically for ramparts, moonlight ruins, and sewer showdown. I believe this would be a good build for deep gorge and cave of corruption also.

This would be probably be good for rooftop rumble too, but a different gadget may be better in the rightmost slot. You could probably even completely take out the multizapper and replace it with the pepper spray.

I am honestly not sure if this would be a good build for canyon gauntlet because of how much the alpha charger moves around, but it may still work out.

There are far better options than this build for breeding grounds and tournament grounds since those rifts immediately take you to the boss, so don't use this build for those.