The deceptive engram was what Year 1 players got in their "The Old Tour" quest. The Cryptarch gave it to you as a reward to piss people off thinking it was a green, but it always turns into an exotic your don't have.
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I got a hawkmoon. It seemed to turn into a previously ps exclusive according to what many others have gotten
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Then there's me who ended up with a Bad Juju
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Hmm. I would have preferred that.
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I got Hawkawesome when I wanted the Monte Carlo