i just wanted to add that my current form for lab3 hard since i passed 250m is:

herja/ezk adam bryn
xxx main xxx
xxx xxx maria

sub 1: pent
sub 2: kahn

many dont want to know this but i now still have to add why its this in particular so if you are an advanced player you can skip this part and move onto the next post:
my banish form is based on this and i switch adam with lance (when lower power it was alci instead of adam), shayd with bryn, aphro with maria, pent with cianna and kahn with thucy). switching the same heroes with the each other over and over while changing from normal to banish to lab form lets me switch faster knowing where i put particular defense runes and where and on what hero my top gear is located (eg difference from tank gear and DD).

the form is self explanatory, maria gets to heal on EVERY turn unless she died, pent comes into play while herja/ezk is most likely still alive and kahn replaces whoever after while khan-pent can duo the entire lab from start to finish.