good : final ending is very powerful
should be improved: under the table

, try rethinking the magicesp process? maybe something more interesting that's not as suspicious.
suggestions: i was thinking the trick could be done with playing cards ripped in half? have 3 marked cards, and cut them down the middle. i dont think this trick needs the whole "patterened back" element you included in it (and for the final effect, maybe you can get a specially printed half one card, half another jumbo card?)
nice idea, good luck with the trick
myseasheep