As said in the video description, any lightning rod with 1500+ eHP will suffice, not just Karma.
And Bashira with her skill up will also work, as she will one-volley eyes.
Dancer, on the other hand, is rather crucial to make strategy work on lower levels, but can be skipped if you have AW Zola.
Anyway, in the long run Marie is better, as her SAW, unlike Viera's, doesn't bar you from killing enemies