How about an EX Series format - Black White Series?

I was reflecting on my last post and realized that a full unlimited format would be really broken (it would make no sense to ban cards on unlimited, as it is unlimied, and unlimited have no bans). So I think the idea of ​​a format similar to the legacy, but that covers more expansions is cool (of course we will need to wait for the launch of the missing sets on the platforms). This format would need a banlist, like Porygon2, Seeker, Giant Plants Forest, Broken Time Space. Which are cards that break this format. So, do you think this idea is cool?