(Replace riven with [Magnetic Rush], the website didn't have it)

Radiation for Valence Bonus
(Optional, you can go something like magnetic to buff the magnetic dmg/shield and overguard strip but i just went with radiation for the extra 80% dmg for the unique elemental)
Magnetic Alternative:
If you decide Magnetic, swap out the magnetic mod with Fury/Primed Fury

I haven't gotten to riven crafting yet but i believe i would look into replacing steel for either a crit dmg/crit chance riven or just crit chance with more elementals, but this would be a budget riven option

Side note....using Kullvero and swapping out Steel for [Organ Shatter] makes for possible one of the strongest primers in the game i believe

UPDATE:
Finished build looks like this
I did end up swapping out radiation for magnetic, but i'm keeping the 5x status for the memes

(Riven will be improved over time but good on this weapon since the heavy attack goes through walls and can be spammed, similar to an incarnon buff without needing to be charged)