Anyone familiar with a trick called " Sim Sala Bim "? common designation is " The Twenty-One Card Trick " (three piles of seven cards each, etc.). This is an awesome magic trick because it just works every time! SIMSALABIM Magic Trick The Best. After the last time, hold the twenty-one cards up, and recite the magic words: " Sim Sala Bim." Next, deal the cards, one by one, spelling out Sim Sala Bim, one.