Magic Trick #6 by Mikael Montier is very nice app and piece of magic.
Many people is looking for best "Playing card in mobile phone" app - this app provides them exactly what they want and even much more!
You can find more apps in the store that provides "Playing card in mobile" effect and although I did not tried them all, I believe that if you purchase this one, you simply can not be dissatisfied.
EDIT: Unfortunatelly app update caused that most frequest Bicycle Rider back design dissapeared from the app. Therefore the overall app rating is now significantly lower then before.