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You can manage & track your card collection and decks once you create an account and login.
Yes, any Mini-Cassette can be put under Blaster or Soundwave regardless of faction. Any Mini-Cassettes you start the game with count toward your starting team. For example, if your starting team has Decepticon characters (including Soundwave) and Autobot Mini-Cassettes, any effect that cares about your starting team being all Decepticons, would not work.