As something that can only be accessed in the shop, there isn't technically a way to rig this. Simply purchase enough card packs and eventually you'll find a 'rare' card. There's basically just a higher chance of finding a 'common' or 'uncommon' card until you've purchased all of both, which is required for the binder completionachievements.
This page was last edited on 7 September 2018, at 21:27.
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