Heres a description for Fatal taken from One (the PDF the effect is in);
The performer takes a blue card out of his wallet & places it on the surface without revealing it's value. The card has a signature on the back of it. He then introduces a red deck & asks for a number between 1 & 30. He counts down to that number and shows the card which the spectator is then asked to sign. The signed card is removed from the deck & placed facedown on the surface. The blue card is shown to be of the same shape & size, the only difference being the color & signature. The deck is placed aside & the spectators' card is dropped on top of the deck. The performer then turns over the card, their signature is gone. He then continues to turn more cards face up, & exentually the whole deck, to reveal their card really has gone. He then invites the spectator to turn over the blue card which is revealed to be their card with their signature on it.
A great effect but I'd say my favorite is the Cameo series as well.
~PaCo