Nourish for viral.
Melee Exposure for corrosive.
Cold.
Radiation.
In [Jade] Shadows, Cold becomes the new meta, while 10 corrosive procs will supposedly still be really good. This weapon lets your procs all the statuses you'd want pretty damn quickly. It is a BEAST of a primer.
For your riven, +[Reach] +attack speed +inital combo (aim for 30, 60 with [Corrupt Charge], lets you get 4x multi. Combo increases disc duration equal to 10s x combo, so that's 40 seconds.)

Wiki says Disc Aura has 50% Status Chance. Not too sure about that, but it's true:
50% x (1+0.6+0.6+0.6+1.6) = 220% SC.
50% x (1+0.6+0.6+0.6+1.2) = 200% SC. (In case you fail to get 30 init combo on your riven, this is what you'll be working with due to [Weeping Wounds])

2.2 * 1.83 = 4 status procs applied every second to each individual enemy. And this is passive... throw out the disc, and you don't have to do anything so long as you stay in one area.

If you choose to use Spring-Locked Blade instead of Primed Fury, you'll be applying 3 status procs to all enemies in range, but your range will become 11-12m rather than 9-10m.

Switch out Corrupt Charge for Killing Blow/[Amalgam Organ Shatter] and the riven no longer needs to be +30 init combo. It will last 20 seconds, but be thrown out significantly quicker. Use it like this if you're looking to move around a good bit. Also, if you don't have Primed Fury, use Quickening, it's just slightly worse. Primed Reach is non-negotiable though.