I think it depends. In a way, it requires people who have invested and can win fights. So I don't think it should be that hard to get chests. Have you tried to increase the level of the cards you have? Also, I would avoid using ghost cards from the starter deck because you get a penalty for not having max level cards or using starter cards.
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I have level 2 and 3 cards, Infact I have level 4 cards as well, with level 2 and 3 summoners. Plus I don't use ghost cards anymore though. I think my ECR just tanks too badly.
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