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My guess is part of the deal to get Sora into Smash is Donald and Goofy are off-limits, hence why the DLC Spirit Board only contains characters that are exclusive to Kingdom Hearts (like Riku, Kairi, Axel, and Roxas). The Mickey keychain was probably left in to remind people who owns Sora.Yeah, you don't have to look hard to see the saw marks where the Disney parts were removed.
Donald and Goofy didn't even get in on background images; I'm almost surprised that Sora kept the Mickey keychain.
I'd honestly forgot about it. Aside from some pre-loaded app that was on the system to show of the ability, the only game I honestly remember using the function at all was Kid Icarus Uprising. Even that was kind of an extras menu thing. I don't remember if it had any impact on the game itself. I'm pretty sure it was minimal if it had any at all.I just played my 3DS again today and gave the old AR cards a shot, that feature was underutilised and frustrating that Nintendo's hardware and software developers were so separated for so long because there was some potential to having games like Pokemon use it.