Probably a dumb question, but are all the usable raid Champs actually viable?

Title. I'd assume they are, since why have "trap Champs" that would make it harder. But I want to be sure before I bring a Champ that isn't meta (was thinking of Venompool)
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/s
Now those champs are kinda useless. Champ pool need to be reworked
TBH, even a Ronan would probably slap with the ridiculous amounts of attack increase you can get from optimal teamwork and gameplay.