I'm expremely interested in trying out these two. They're both legendary so they can be protected with Karakas, and they're tutorable with Sisay if you run her. Shalai in particular is a huge addition to the deck, giving hexproof against most removal and discard in the format. Even if her activated ability is wasted she's still a huge bomb.
They're also both 3W so they don't require a big colored mana investment.
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http://www.hipstersofthecoast.com/2017/08/modern-assault-loam/
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Cuts
Manabase
Plains
Dakmor salvage
Arid Mesa
Sacred foundry
1 Blood crypt
1 ghost quarter - being 4 color, colorless lands hurt you that much more.
Adds
Manabase
2 Temple garden
2 fire-lit thicket/rugged prairie - you likely want something that filters RR while being able to add green or white. Makes fetching easier for the colors you need. I lean more towards RR producing lands because assult is RRR
2 raging ravine
I also personally would like to see ajani Vengeant over liliana if you want to go jund+w.
Cuts
Spells
1 flame jab
1 raven's crime
1 Molten vortex
2 Abrupt Decay
Adds
Spells
2 ajani vengeant
3 Lightning helix
It seems like you really want to be more Naya black, I suggest trying these changes. The helix and ajani can offset lifeloss a bit and having a slightly stronger white focus gives you rest for the weary instead of feed the clan out of the board. You'll find landfall much easier to accomplish than ferocious.
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