I have an idea for a trick deck and I was wondering if it's been done before. So basically it works a bit like a Svengali Deck in terms of concept. All of the cards are regular on the top half of the face but are the same on the other half. For example, all the cards' faces are split in half so that on the top half it's an ordinary random card however on the bottom it's the same for each card. Let's say the 3 of spades. There are lots of things you could do with this. Hold the deck so the random cards are towards the spectator and you could riffle the cards and fan them face up to show them all different. Then to force a card all you would have to do is spin the deck, have them touch a card, and out jog it. You just need to make sure they don't see the bottom half of the card. And then you could turn all the cards into that by just fanning them again. Oh yeah and the bottom card would be a completely normal card. It's a bit hard to explain and it would require an entire deck of specially printed cards but what do you think?