Hello Skylords, Me and my brother play in two PC's in the same room and in the same house, and we're always trading some cards between us, is there any chance we'll be banned by the multiaccount wave?

The chance is always there but very low. Multiaccount bans are done on case by case and through use of multiple flags. As long as you are not trading unfairly between the accounts, there shouldn’t be any suspicion on your accounts.