My friend introduce me this game and it was a great. You need to analyze and make strategies in order to win. At first I tried using cards that has a huge life but then I realized that there are rules in combat and there is also skills that could help your monster win. I lose so many times on my first day of battle because I just pick cards without knowing it :) . Right now, I am a little bit careful on choosing my cards during battles. Hope I could reach Diamond before the season ends so that I could earn lots of chests.. I only have 13 days left to achieve it. Good luck for me