My new guess is that Xur put way more effort into whatever magic sparkle-paint he makes it with than he does with his weekly stock choices, otherwise I wouldn't have built up 968 strange coins.
Does it come up somewhere in the Reef when he's there? Or still in the tower? [spoiler]But thanks to everyone that pointed out that Xur puts it up whenever he's present.[/spoiler]
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Just imagine all the faction packages you will get once RoI comes out