Thanks ! I did try with skeleton party but found it harder. Witch doctor is very stronger and cheap. For the 3rd phase you need to wait for the timer to go under 0 to have double gold income. Then you summon 3 times Drakkisath, one to pass the phase, and one each side to kill the elites. Whelps helps a lot and bandit has to be used as a defender to stun the elites
As you can see my p3 begins at 0:00 and I have already a boosted Drakki heading left. Pyromancer and bandit are the key to handle the p3 transition for their damages and control
Because the witch doctor is able to solo all whelps on the right if you deploy him the good way. So drake is only required left. Also a drake left can kill enemy’s at top left tower easily