Riven is very flexible, you can use [Hornet Strike] if you're lazy, but you should really be using a Primed Expel mod in this slot if you don't have a riven.

Riven stats to look for: Damage. Multishot. Toxin. -Zoom. +recoil. CC. CD. -puncture. -impact.

Incarnon evolutions:

1: default
2: Carnage reign
3: Marksman's hand
4: Commodore's Fortune

The build is very straight forward; build incarnon > Hit ONE headshot for passive (so electricity turns into corrosive) > Hold left click > Profit.

This build has been extensively tested in both SP disruption level cap and SP Void cascade level cap.
It easily shreds lv9999 with NO PRIMER (as long as you hit ONE headshot to activate [Dual Toxocyst] 's passive)

edited for new patch, still good.