An impromptu iPhone effect where your spectator controls the alert of your phone and then you read their mind.
Reveal a spectators card on a tab from a box! Make it morph from one card to another or make it appear!
Reversed Under Pressure
A cool-looking flourish which, like a fan, shows all the cards in the deck.
See the future. Predict when the spectator will say stop. A card magic effect with a message.