Two Questions for folks here:
What do you think of the wildcard effect where some cards are taken from the pack, shown then tabled - and then a wildcard chosen? Patter might go from fashion among peers to the season finale of Dr Who but the idea is The Illusion of Conformity.
Second question - the use of "WOW" in routine? A hands off change or too much apparatus for the working guy to bring from table to table? I'm thinking you make a dogpile of dupes on top of the one remaining non-dupe and slip them all into the wow, turn the thing over so they can see and end with a visible change where you have all the heat on that face card which they can take and look at. :D (yes okay that's a Matrix reference)
Getting back to the Dr Who topic - what do you feel about changing them back at the end - say by breaking the spell and having them looks at several cards from the unaffected talon at the same time? That versus having the entire pack become of a kind. IE what works best when one is working and folks want to come back for the next show to see it happen again.