Cards are rated in Quality, which goes as following: Common → Rare → Epic → Legendary.
Legendary cards will obviously give you the biggest advantage when compared to their Common-card comrades, but they are much harder to find. Keep opening chests to find these cards, and make sure to brag when you get that super awesome Legendary card!
Psst - Chests from the Shop increase your chance of finding Rare/Epic/Legendary cards.
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