Shuffle the deck. You can shuffle or cut any way with a glide force.
Looking through the deck, memorize the top card.
Shuffle again in a way that gets the memorized top card all the way to the bottom.
Holding the deck, face down, carefully glide the bottom card towards you about an inch.
Now, no matter what happens, you have the chosen card of a spectator at the bottom, but can deal from the bottom without removing that card.
Use this force during tricks where you want to do a simple reveal that you placed a card randomly into a shuffled deck but knew where it was all along.