Another potential ban: Tatsugiri
Why tatsu? I'm talking about specs sets, 120 spa with dragon type is pretty much. He isn’t broken, but forces you to get a dragon resist or a spd mon with recovery. Welp, tatsu isn’t uncheckable, it’s why i say "potential".
I had this train of thought a while ago : Specs DM looks like something that destroys the tier... until you remember that our tier is heavily spedef oriented, that Tatsu is frail with very little real defensive value (although its ability helps), that it comes with the opportunity cost of not being the removal for the team and that it puts itself into undesirable positions with the spatk drop. Our tier is also focused on pretty offensive BOs right now so its limited speed tier is manageable.
You can even have a few common fairy and steel teras on mons like hecid, bombirdier, cramorant, milotic or snorlax to help with it. We have a lot of decent means to play around it and it's just a nice balance breaker at the end of the day.
Yes, you will likely have to play florges, aloslash if you want to go for a bulkier style of team, but it's not like it's the only restrictive mon in the tier who forces you to a play a bit more proactively, and these mons are staples to begin with.
What could have made tatsu broken is its ability to abuse passive stuff like milotic or palossand, but the former can adapt (alluring voice is common now), and the latter is just really prone to inviting special breakers in general, not really an issue related specifically to tatsu... so it makes sense that you have to compensate with a spedef mon with recovery, just like you have to with kilo, brav-h, hoopa, specs florges etc.
Tatsu is scarier in theory than in practice and the fact this set isn't played that much is proof that it's not easy to play and slot on teams. Don't play the passive game around it and if you still want to do it, there are a lot of less common solutions to play around it (frosmoth, grimmsnarl, av regen mons, whimsicott, porygon2 and chansey...)
Some of these can get destroyed by tera dragon but then it's a huge commitment.. you get the idea