First off, it's a video game and you will be hard pressed to find any legal process that would take you serious enough to even look at your one off case. An EULA, TOS, Release form, waiver etc will not protect anyone from criminal negligence. These are not binding contracts in any form. In a civil case technically it still won't protect them from anything but civil court plays by it's own rules and a judge could tell you to go F-off for wasting his time and make you pay Blizzard for wasting theirs too. This is where the jury shrugs their shoulders and says you agreed to it.

Your only argument is that you have played WoW this way for years and now they change their TOS, ban you, and kept your unused/prepaid subscription money (you paid based upon an older agreement). And you should win your argument.

There would have to be some sort of mass class action level lawsuit for fraud or something to land this into a criminal court and that's not going to happen either. If you felt wronged, you could file your complaint with the court and that would run you about $90-$120 or so; wait for the lawyers at Blizzard to respond while hoping they don't and you win your argument because they are a no show. Then I guess you could laugh across the internet when the judge awards you less than $15 for the banned time on your subscription. But Blizzard will never pay you the damages.