As someone said over at alphagamer, we're all likely to be banned once they completely fix the issue. They're just waiting to fix it first. No matter what you do, as long as you have duped units or +1/+10, you will be flagged/ or already have been flagged by their system. As you know, new units have a flag that shows they've been summoned for the first time. Duped units do not have this flag. Whether you duped it from the story or the arena, it doesn't matter. All it takes is a simple database query to check if you have any units you didn't summon. They likely have this info already, but they're just waiting for the exploit to be fixed so they only have to do one database query instead of multiple (i.e. a single major ban wave). Right now, they're just banning the blatant arena hackers to assange the complaints of players. But rest assured, unless the only thing you've done was modify your own units, you will be banned. The only way to be safe to is to send home your duped units and wait for a summoning exploit to be released.