We’ve discussed putting logic like this into the mode numerous times. Every time we get close to doing it, someone argues with us that the point of the mode is to allow for “broken” comps and that’s what makes it fun for them (i.e. 5 Mercys and a Bastion).
I’m really torn because I understand both arguments. For me, personally, it’s frustrating that the game doesn’t build better comps. But I also understand the fun in “whacky” comps in this arcade mode.
Perhaps we can try an alternate game mode to Mystery Heroes at some point… “Slightly Balanced Mystery Heroes” or something along those lines.