This is one of my favorite card tricks. It took me over 6 months to create and perfect this routine.
In a nutshell, a spectator names a “4 of a kind” in this case, he chooses the 8s. The cards then turn face down, one at a time. Then they turn face up, one at ac time. Unbelievably, the cards then turn into the ace of spades, one at a time, then they all change into the Kings. Finally to close the effect, 2 of the selected 8s have been in the hands of the spectator the entire time and the remaining 8s were in the magicians back pocket.