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the reward cards you can buy with your earned glint

Ohk. Does it mean I can buy only reward cards in shop using glint?

no you can buy a lot with it in the shop, but as a starting player I would focus on rarity draws, for example buy 1 or 2 epics every season and use the rest on rare draws, commons will come over time in league promotion chests for free

Thanks for the suggestion friend. I will follow.

happy to help!