Taking a shot at visualizing changes to main screen. First thought is it seems very text heavy. Transactions term is odd I suppose. Ideally, card "transactions" would be aligned with cards/decks, but tight on space over there.
Main two goals are to make it easier to see where you go to edit decks and to make it clearer when you are PVP-ing someone. When I first started, I was perplexed why I couldn't intuitively figure out where/how to make decks. Having top 10 decks on main screen (with name/mark and clickable would be VERY nice. For PVP section, the idea is after clicking invite to PVP (or being invited), the text "Serprex has sent you a pvp invite!" and accept/cancel buttons will appear, perhaps even flash/glow. People now do figure out the invite is in chat, but that's also not intuitive if two new players want to play each other.
Notice I removed the bazaar and custom buttons. For now, they seem to add more confusion and no real benefit to players.