12 arena battles free of charge, instead of 10

Here are the facts: if you win, you receive 20 crystals. If you lose 10.
So, if you initiate 10th game, you pay 15 crystals but you if you win, you get 20, meaning 5 plus. ( if you loose, you loose only 5 but win 10.)
Same calculation for 12th battle.

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