This is a very good and entertaining trick. The only issue I have is that after seeing the method, I thought it could be modified slightly to use a regular deck, perhaps with four add on cards instead of having an entire deck just dedicated to this one trick. I personally am not likely to do another trick with a deck that is mostly blank face cards unless it is an ambitious card routine using one of the blank cards.
It also occurred to me that it would be a pretty good trick with just thought of dice rolls where you write the numbers down on small bits of paper.

Bad Bikes is a very entertaining, easy to do effect that gets a good reaction (so far!) from spectators. There is some inherent humor when the magician claims that he has the “technology” to find any misprinted cards and rolls out four dice to do the job. A well-thought out effect that will be first call with me for a while.