Ah yeah, I saw that too on eBay. There's a Peach one too. Total guess here but I'd say it's random, not by region or anything. Hard to say if any of them is more rare than the others. But I can say this card case is the first thing I've ordered from the catalog that came with one of these cards, and unlike the Mario one that came with the Majora's Mask soundtrack (and apparently the
2014 calendar)?which says "Congratulations on Achieving Elite Status!"?these Mario/Luigi/Peach/Toad cards say "Thank you from Club Nintendo. We appreciate your continued feedback & loyalty. We hope you enjoy your [nonspecific] Club Nintendo Reward." And it looks like they are now being included with just about any reward you can order from the catalog (
Cleaning Cloth,
Wii Remote Holder,
Pen Case,
Luigi Pouch,
Mario Pouch, etc). I got one of the Wii Remote Holders back in June 2011 and I'm 100% sure it did not come with one of these cards or anything else, but it does now apparently.