Although most seem to be against card effects for kid's shows for obvious reasons, I think this one would play well.
"A totally captivating magical comedy routine that's enjoyed by children and adults alike! Great for stage work, but can also be performed in close quarters, and surrounded.
Let a spectator choose a card from the deck by removing it, looking at it, and replacing it into the deck. Introduce the magical card duck, who has special powers- the duck can instantly find the chosen card, even though it is buried in the deck. Place the deck in the card holder in front of the duck, and suddenly the duck springs forward, puts his beak on the deck, and springs back with the selected card firmly gripped in her bill. This is a time tested favorite that gets a great reaction every time!"