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 so that I could earn lots of chests.
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From @an0na