In doing some research for my version of this effect, I came across a despicable omission by Jim Pace and Steve Dobson. I was looking at 6-card packet effects that use an Elmsley count and of course the most famous one is "Back Flip" by the late Sam Schwartz.
A few years ago, I picked up a packet trick called "Alien Autopsy" by the aforementioned Pace and Dobson. Actually, I bought several of them because they were being sold real cheap and the trick came with some very nicely made plastic cards with pictures of aliens dead and alive. This was also a 6-card packet effect using the Elmsley Count.
As I dragged it out this weekend to check it out, I realized these guys had simply ripped off Sam Schwartz's "Back Flip." It's the same trick. The moves are exactly the same (both tricks use the Back Flip Count) and the cards are analogs for the cards in "Back Flip." They had changed the order of one sequence, but the effects and the method were exactly the same. It's as if someone had painted Harbin's Zig-Zag a different color and then claimed it was a new trick they had invented.
Nowhere in the instructions for "Alien Autopsy" is Sam Schwartz or "Back Flip" mentioned. These guys are beneath contempt.
Too busy to think for themselves, they overlooked some alternate methods they could have used that would have improved the trick. Sam Schwartz was miles ahead of these guys: he kept thinking about his trick and in THE MAGIC OF SAM SCHWARTZ by Allen Zingg (Magico 2003) he offers "Playback." Using just 6 non-gaffed cards (counted as four) and a clever patter story about a lazy gambler he gets four amazing effects. The kings turn face up one at a time. Their backs change from blue to red one at a time. All the cards turn into the king of spades. Finally, the cards become 4 different blue-backed kings.
Maybe Pace and Dobson made a deal with Schwartz for his trick. If they did, good for them, but at least they could have mentioned it in the instructions. Their cards are very nice; they obviously went to some trouble to produce some excellent props -- but my autopsy shows who's really responsible for this trick, Sam Schwartz. He should get all the credit and, at least, his family should get some of the money