This is very visual and effective close up magic trick.  Place one card from the walley face up on the spectactors hand. The second card is placed  facedown on top of the card in the spectators hand. Next the helper places their hand on top of both cards. Magicians gestures and the top card goes blank and it is found printed on the back of the card underneath it!  This effect always gets a great reaction. Easy to learn and perform. Self working.  Magic that happens in the spectators hand always gets a wow reaction!