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There's an app available that shows off some basic AR functionality called ViewR https://play.google.com/store/apps/details?id=biz.buelter.viewr
One of the targets is a Magic The Gathering playing card that, when in focus, shows a 3d model of the creature on the card. This was also very inspiring for my dream AR app. Anyone interested in android AR VR apps should give that app a look.