This is why they don't let Superman play in Vegas :)
Setup for this included setting out the cards on a blanket on my table. Camera was on a tripod looking down, with a cable release attached, and in bulb mode. My 430 EX II was hooked up to a wireless flash (with a button I could press to make it fire), and secured to the camera with a GorillaPod. The flash also had a diffuser on it.
Shot was taken by first popping with the two see-through cards face up, then removing the cards, and popping the flash three more times.
Post processing included cropping, reducing brightness, increasing contrast and highlights, reducing shadows, upping saturation and sharpness, and adjusting the RGB curve a bit.
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Interesting idea. IMHO you could have used a looser crop and I would also get rid of the upper left pile of cards as it's making the photo too simetric.