IMO, level 1-3 at least I’m not using healer. use heal pot items if needed instead.
Yup, that’s what I’m doing with my 2 Proteus at stage 9 and 10.
You can see the latest discussion August TOV:
[August 20, 2020] Tavern of Legends Event – FAQ & Team Discussion
And follow this link with any usefull info and history.