You show four of a kind—say 4 kings—and 4 face-down “prediction” cards. Someone names any king—say the king of hearts. You set the kings aside, then reveal that each prediction card reads “KH!” But that’s not all—the king of hearts vanishes from the king packet and appears among the prediction cards! The predictions have vanished—a 4-Gone Conclusion!
 
Complete—very easy to do—great effect!
 
Original cards are Haines Fox Lake.  As a bonus, I will include the necessary cards in blue and red Bicycle to update the performance if you choose.