I collect specific artists. I currently have a complete set of Sachiko Adachi, and Asako Ito.
I am working on a complete set of Yuka Morii cards, and am about 49% there!
I'm thinking about starting a set of the Oshawott Line, since it's one of my favorites.
I'm not a very good deckbuilder, so I usually yoink lists from other people to use. I'm really into Gym Leader Challenge (GLC) format right now. Here are some notable lists I've used:
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