The new generation of marked decks.
The spectator remembers one card from the shuffled deck and puts it back face down, and squares the deck.
The magicians back is turned while this happens.
There's no way the magician can see what card was selected, but the magician can tell the name of the selection without touching the deck!
You can use this deck just like any normal deck, and it can be a great help in an extreme situation. That... is the "Stealth Deck"
You might be bored with this phrase "use this deck just like any normal deck"... but the Stealth Deck is completely different.
No matter how hard the spectator examines it, even if she/he is a magician, it is impossible to find out its secret.