The vast majority have Abilitys to spend their MC on. While not over powered outright, the sheer amount of times a fluidmorph can pull out their stuff is OP.
Fla'gamp being a prime example. Especially with that one overworlder..starts with a B.
Only Lam'inkal and to a lesser degree Nunk'worn dont but their elements,stats and side abilitys really really make up for that.
Im not saying I dont like playing with them but if I'm being honest they break the game. Having access to Scr and deadwater are just crazy. Deadwater and unheard can just ruin a najarin.
Najarin and Tart are Marrilian counters because Marrilians are overpowered. Almost Every chief has a crazy abilitty. The main 4 khralls counter entire tribes..
If I had to pick a strongest tribe itd be marrillian. Overworlders only put up a threat cause they're the only things that directly interfere.
I would HATE if Najarin ff and Tartareck psi got banned and everything else didnt. Their would be no reason not to run fluidmorphs or Cheifs. All their checks are gone. Roar of the mob? Useless. Itd be a dead card especially if naj is gone and fluidmorphs could just spend the mc before it resolves. Frozen fire would be it and if you run flagamp its literally nothing.
This is a rock paper sissors game to a degree with all the specific hate cards like magmon retaliator etc and if Marrillians can take every tribe then they should have these huge counters to them.
You also could just run the foothold that brings chiefs back anyway... they waste tartarecks counters and that 1 OW mugic for nothing