Hey, Fresh is trying to sell several things for brain eaters. He has deadland riders listed, so go check out the trading area.
My squad that's doing well on level 9 is wasteland rider v4 - primarch v4 - Particle Plasmablade v4 - Big Rig v2 - Canis v4. For the field before the boss, I switch out the primarch for my leader, and I trade out the Big Rig for Eve v4.
Just be careful about the multi-hitters (hit X number) vs. the carpet-bombers (hit everyone) and switch them at the right time. This is only the 3rd nexus that's triggered for me in 3 days. The silver lining is that I now know that the nexus sprites will trigger on Bluestacks.
Now if I can just start capturing floor bosses ...