Easy trick. He is simply moving the cards with both hands. Watch his fingers on the left hand. They are moving in and out whenever a card "magically" appears. Also watch his left hand index finger - it occasionally moves over the top card which keeps it in place so he can deal off the bottom. Besides the practiced dexterity, the key to this trick is having new flat and slippery cards along with a little extra grip on the fingers tips. This guy is pretty good and has spent a lot of time with his presentation.
MiG