Wave 1 Build: Auras, Buff beams, shroom pits, swap to guardian, build guardian stuff in combat of wave 1. Swap to summoner, move to position, TB and upgrade as desired and roll through.
Party: 1 TB monk (also your upper), 3 summoners with monk/huntress pets
Hint 2: take advantage of LoS and hide this group behind the bushes.
Hint 4: TB stands here to catch the full build (once upgrades are done)