The 'Explanation' That's Actually Another Trick

Hey everyone!

I'm looking for an effect to close out a small show I'm doing for my friends on New Year's Eve. Nothing too fancy, just some intermediate card magic.

The kind of effect I'm after is the classic one where, after you finish it, you tell them you're going to explain how you did it, but while you're explaining, you're actually performing an even more spectacular one.

It would be similar to the Changing Dot effect – you do a trick, explain it, and it turns out you're actually doing another trick they can't explain, but with cards.

Anyway, I hope someone can help me out.

Thanks, and much magic to you all!