I found the best way to do it to be changing the worth values of the decks in a mass deck (for example, my lucky dog deck is worth 3, and +anima is worth 4). Then you can just display them the same way you display special decks, with the code below.
If you don't want to change the worth though, you can also display individual mastery badges using the code below. This does mean your badges will show up twice though (once in their proper worth section and one wherever you individually call it):
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If you don't want to change the worth though, you can also display individual mastery badges using the code below. This does mean your badges will show up twice though (once in their proper worth section and one wherever you individually call it):