New Combo, no luck needed.

Wild Golden P/S - Call Lightining
Lil'XT H/P - Boombot then spam Zap
Clockwork S/B - Turret then Fist

Did it with Clockwork, Lil Xt, and a Devouring Maggot. Open with Maggot and Goo, then burrow attack (mine missed) Clockwork comes out next, have him 2nd since he and Lil Xt have the same HP. Put up Turret, punch in between, put up another Turret. Might be some luck involved here. When Xt comes out s...