Wondered which card in Clash Royale has the biggest threat to your Arena Tower and how much damage it can do if you don't have any cards to deal with it? Ash took some time and made a compilation and comparison video on this topic. From this video we can learn that what cards you should be careful with and what cards you can just ignore.
There are indeed different card levels so in this "experiment", Ash used the Tournament rules, which means every common card will be level 9, every rare card will be level 7, every epic card will be level 4, and every legendary card will be level 1.
Source: 2p.com
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