Maxello Magic

He fails to name the card, so he pulls out his Insurance Policy for just such an accidental eventuality. Reading out the terms of the policy, he opens it to reveal another card, but he's still wrong. Policy is unfolded again, another card and still wrong! Finally he opens out the complete policy, and it displays a large replica of the selected card.

An entertaining find-a-card effect, large enough for the biggest stage.