easy ace estimation from card college four i think it is, an outstanding trick, and something that is definitely worth perfecting, simply because of the impossible appearance of the the effect. it will fool both laymen and magicians, check it out!
Start by putting the deck in a known or necessary full stack. Then, do two Reverse Faros. The deck will be shuffled in appearance, and two perfect Faro's will reset the stacks. This has an UNLIMITED amount of uses.
Also, if you do exactly 8 perfect Faros in a row, your full deck stack will be retained.