A card is selected from a deck of cards, say it is the 5S. A packet of three Jokers is introduced. The 5S is placed among the Jokers whereupon it instantly turns face down. It is replaced and turns face up.
 
You then draw an X on the back of the 5S which is placed face down in the packet. The cards are counted and now the 5S is face up with an X on its face. The X visibly disappears off the face of the 5S and now all the Jokers have an X on their faces!
 
Complete with the special cards (use any deck). You will put this routine in your act immediately.