Although I agree that gladiator cards are OP in bronze level, I don't think banning is the way to go here. In the past, the game always found ways to counter strong abilities in order to keep the balance. A new ability can be added for example, something like giant killer that only works against gladiator cards or a protection ability that prevents all the damage from gladiators. (I'm just making up here, i'm sure the team can be more creative)

I was in bronze once and LLama was a way bigger obstacle to handle than any gladiator cards, and it was too expensive to rent everyday. So instead of suggesting a ban, I just spent hours to think of new strategies to beat LLama+Kron. Actually it really helped to improve my skills for the long run. Same thing can be done against gladiators.

And let's be honest here, the main problem is Quora by far. With 2 martyrs on each side, it is very hard to beat that line-up. But it's not impossible.

I'm fine with removing "are you not entertained" ruleset from bronze, but removing the summoner abilities is not good idea imo.