B-debo, what exactly are GHIEST's two "powerhouses"? I'm guessing you mean
Leviatonn and either
Toro,
Rolph or
Methane, of which absolutely zero are overpowered.
In Levaitonn's case, he's a just full stop. There's absolutely nothing else he has to help him win. Sure, he puts him and his opponent on even footing with no abilities or bonus, but even footing is a scary place to be for a 6 power card in an enviroment with plenty of 7 or 8 power cards.
As for the other three, yes, they are very solid cards. Nowhere near bannable though. In Rolphs case, he's meant to be powerful, he's 5*s, and that's a huge amount of space to use in a 25* deck. And for
Toro, or
Methane, they're staples, and you'll be hard pressed to find a GHIEST deck that doesn't use them, but even then, there are more threatening 4*s out there too. Take a look at
Marina, or some of the banned ones like Graksmmxt. Even Marina's not banworthy, and she's an effective 9/5 damage reducer against non SoB.
As has been said in threads all over the place now, stop whining about the top clans and do something to change it instead.