Agreed 100% with Prae. If you're destroying or transforming a deck of cards, that's the end of your card tricks. Unless you can find a good reason to put the cards back together. I ran into this when trying to routine my street stuff. I have an ACR that ends with the deck turning into either a solid block of bullet proof glass, or a pile of steel plates. After that, there's no graceful way to bring the normal deck back into play (that I've found. I'm actually working on transforming them back but it's proving difficult).
The idea reverhart had is pretty good, having their card restore itself while the rest of the deck stays destroyed. But honestly, I'd probably just make the destroying routine your closer.