So frustrating! Way too often I spend material on a new card and the game crashes. I spend the cost, but I don't receive the card. Also, it happened more than once that I complete all missions to receive a rare card and the game crashes and I don't receive it. Extremely frustrating. In addition, way too often the game crashes during a match. I can reopen the app and try to rejoin the game, but often this causes me to miss turns and loose the match. It seems like a lot of work for nothing. It's a pity, because the game itself is amazing, easily the best game for android if it wasn't for all the problems.