For this non-damage heroes challenge, I use Sulley, Mal, Mickey, Alice and BayMax.
The first time, I tried super hard CW and could only defeated 12 fights and stuck at the 5th district so close but…
The second time, I tried hard CW, with the same team and completed the challenge at first try
@NCTzen_Haechan As I can see, what your team lacks is non-damage heroes that could do huge deal of damage. Sulley could heal, Mickey could boost, Olaf could freeze, Wall-E provide some extra energy and then you use the last one is Yax…
Too many healing heroes, my friend…
If you have Mal, I suggest you use her because eventhough she is a control, she deals so much damage it’s crazy
You could also try Moana’s friend disc for Olaf. With that disc, if enemies is frozen while already being frozen, they would take extra damage, making it easier to kill them off
Hope this helps you complete the challenge