Update: Had it at 5 stars, but my interaction with the developers was very difficult to establish and I could not contact them through the app store. I'm constantly matched in events against much stronger opponents. My game is always crashing on head to head. It is very difficult to get cards. This is a big money spending game. I put up $50 and didn't leave with a single diamond or onyx card. You would think the packages that cost upwards of 5k in coin they wouldn't offer a ruby card as a win.