When you win battles you earn DEC which is in-game currency tradable and can be used to buy cards etc,

when you lost battles you drop down the league, there are Novice, Bronze, Silver, Gold, Diamond and Champion leagues.

Each league has 3 sub-leagues. I play in Gold league III, if I keep losing I will drop down to Silver league I where rewards are less compared to Gold league III, if I keep wining I will advance to Gold league II...

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