Your spectator chooses a card but the magician fails to find it. As a
reward for besting the magician and a chance to win some money, the
spectator plays a game of Dough or No Dough. They are shown several
cards with briefcases printed on one side and different denominations of
money on the other side. The magician shuffles the suitcase cards and the
spectator eliminates cases until they are left with only one. By showing
several of the already eliminated cases the spectator believes their case
could contain the $50. When they turn over their briefcase card they are
surprised to see their chosen card printed on it instead!

Take your audience on a journey they are familiar with! This commercial
and modern effect has it all.