It was actually discussed a few times here on the forums, so I'm sure you can find a lot of information about it by doing a search. It was first published by Lin Searles in the 30s or 40s. I know David Harkey popularized the concept in his book, Simply Harkey. And if DVDs are your thing, you can find a pretty decent explanation of it in Gregory Wilson's Pyrotechnic Pasteboards. From what I can tell, Cheng's Riser uses the Inflated Deck concept followed by a simple color change of some sort. Not really groundbreaking, but it's good to see the move explored again.
People have used the Inflated Deck concept with Ambitious Card in the past. I remember it being a major trend in the late 90s. I used it as the middle phase of my routine for a very long time-- I think I learned it from an old Ben Harris manuscript. Hopefully, this gives you enough leads to do some benficial research.
RS.
