A Riven-enhanced Critical build intended to work in conjunction with external Crit Chance Multipliers on a Toxin-roll [Kuva Quartakk], working as follows:

*Updated Oct 1, 2021

Primarily based off the stacking properties of Primary Merciless, [Galvanized Chamber], and [Galvanized Scope] in combination with the multiplier of the Viral status.
At full ramp for stacking mods and status effects, [Hunter Munitions] procs benefit from Primary Merciless, [Galvanized Scope], [Vital Sense], [Primed Cryo Rounds], [Bladed Rounds], if used in place of a riven, and the Viral HP damage multiplier.
If other damage types are needed, [Stormbringer] may be used in place of [Primed Cryo Rounds] for Corrosive, and [Hellfire]+[Stormbringer] may be used in place of [Hunter Munitions] and [Primed Cryo Rounds] for Radiation Crit builds for Eidolons or Thumpers.
For my personal use, I use a 291% Strength [Teeming Virulence] [Nidus] build with Arcane Avenger, for an additional 349% + 45% (when Damaged) Critical Chance, leading to persistent red crits after a short ramp period, functional and tested against all factions in 45m Arbitration Survival and a variety of SP missions including 30m Survival.

If you try this build, feedback on results would be appreciated. Good luck, and have fun.