Introduction
This is my recommend [Saryn] setup for buffing yourself or teammates with [Venom Dose] and Toxic Lash.

[Venom Dose] and Toxic Lash combine to create a lethal weapon buff. With Viral on your weapon, you deal Corrosive, Toxin, and Viral damage - three of the best procs in the game. Using a Viral/Heat weapon or Viral/Slash? It gets even more nutty. While you can't share Toxic Lash with your teammates, you can give them [Venom Dose].

Molt is your emergency escape button. If you're taking heavy damage, pop your Molt to avoid damage.

Substitutes
You can replace Arcane Momentum with the best damaging Arcane for your weapon. I pair this setup with Snipers, so the additional reload helps me out a lot.

If you want a little more range to easily share [Venom Dose], you can replace one of the R0 Umbral Mods with [Stretch].