To Cardkiller13 ("Maleek"):
Your palming, in the extraction (taking), transportation (holding it, moving your hand around), and replacement phases, along with your handling of a double (two cards), needs a lot of work before you should perform for people.
I agree with SKSleighofHand, changing the card back doesn't fit into any sensible story that I can imagine at the current moment.
Also, the trick concept is very old, as you should know.
Daniel Madison has a trick called "Lapse" in which the execution and general sleights are similar to yours. This is nothing new or surprising.