I'm rank 4 in competitive PVP, but I still manage to lose constantly in Solo Arena. I haven't won a grand tourney in like 8 attempts. Can you make it easier or add a tutorial that helps you build better decks for solo arena?
What I do now is just concede three times to get the card pack, it's better than wasting time losing to the OP AI.
Low cost start and balance that with some high cost punch. In fact there is a forum thread on this very thing in general. Search solo arena.