The trend is in the right direction! I sometimes het frustrated reaching that wall or plateau as well but then I think about the fun I have learning from some of the teams I get matched with so it makes it worth the effort. Not to mention how great it is to open many more cards at the end of the season!
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The extra 15 cards indeed make it worthwhile just as the learning curve.
Also the 5 extra card with the daily rewards could be handy. It of course all depends how lucky you are!