Very nice ouch (can I call you that?)! Overall a very good effect and I'm sure you'll get great reactions from it

. I have a few comments, minor but there you are. I seem to have written rather a lot, but don't worry, it's mostly puff.
There was a flash of the palm. I guess that's probably because of the angle in which case there's nothing to worry about, and a spectator almost certainly wouldn't notice it anyway, but I've pointed it out.
John Bannon makes the point in
Smoke and Mirrors that it's not a good idea to introduce a prediction early in an effect as that turns the rest of the effect into a 'challenge' - "I know that that prediction is going to be my card so I am just going to see how he does it". The fix for that would be either to introduce a sealed envelope, without saying that there is a card in it, before you start, or else to introduce the red prediction after the card is selected and signed.
The selection and return to the pack was slightly fishy. I would recommend a spread cull force (which also has another feature that is good for this effect) and a spread cull, or something similar as that looks much more natural. There wasn't really much reason to take the card out, shuffle the pack, and put it back in again. EDIT: Actually, now I think about it there was as it was a nice convincer - still, it doesn't look natural. How about a glide from the face of the top half? (Or how about a bottom slip cut force plus an Elliot control (if you have no idea what I'm talking about PM me

))?
Anyway, once again those points are really minor. I'm just nitpicking because I feel in a verbose mood

.
Kati
Scriptorilsky wrote:And I don't get the effect because the same signatured card coul really be in the envelope
How? Not if that were a spectator's signature, obviously...just because he has signed it himself doesn't mean that it won't work for a spectator.