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I had bought 10 packs twice and a lot of single cards. So I am well ahead of fans needed to run any missions for a good while. I haven't grown the account lately but will need to look at picking up any unique cards that have been released in the past couple of months.
!PIZZA

I used to buy individual cards and occasionally I still buy the cheap ones I don't have. But otherwise buying 10+2 packs seems more profitable.