Pay or dont bother playing
What starts off as a fun card game with a cool world and art is quickly lost as after playing for a few hours enemys cards become insanely strong with no regard to balancing cost the only way to continue playing is get new cards but the only way to do that is buy them... It could be a good game but the developers clearly care about making money than making a fair and fun game. Just download hearthstone for a much better experience.
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Order & Chaos Duels - Trading Card Game