Well, we can't all do all the same content with the same ease or difficulty. Much how like I don't think your account and/or skill are ready for Necropolis, I don't think your account is ready for BGs. Do other content and come back when you have a more adequate deck to play, as even though it is rough, these new matchmaking changes demand a more ranked deck to participate effectively than the one you have now...
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I mean come on….. this is exactly why the change was necessary