This effect is very visual, and very simple to do. There is really only one card move you'll need to
do and it does leave a little discrepancy as it's executed, but your spectator will never notice.
The instructions are written for a table, but it is possible to adapt this to walkaround if you use
a spectator's hand as a temporary table. You'll also need a jacket or breast pocket in your shirt
(if you don't wear a jacket) to make this look as presented. You can use your jeans pocket if they
aren't too tight. Refills are available and you'll probably need them as you only get 12 to start
out with.
The nice thing about this is that the gimmicks come 6 of one kind and 6 of
another so you can repeat this at a close group and have a different card chosen.