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Since this is the only leak thread right now, I wanted to share something a friend of mine recently. He is a Nindy dev with published games on the Switch and received a prototype amiibo card directly from his Nintendo contact a while ago.
The card is double sided, and when tapped to Hyrule Warriors (alongside the NFC tags) read that it was an unrecognized amiibo. Just wanted to know if anyone has seen anything else like this anywhere else. No idea if it was a test for possible amiibo functionality pokemon cards or not.