Look at the back of your cards. Most decks will have a repeating design that looks the same regardless of which end is up. Some, like my Rider-Waite deck from the early '70s, have a design that won't--these have ankhs on the back so it's easy to tell whether or not the cards will be reversed when I pull them from the deck.
One way to get reversed cards is to periodically flip one stack around when you're shuffling. I assume you're using the riffle method? This means you're shuffling the cards as you would playing cards. If you're not, try it--it takes a bit of practice because the cards are larger, but they also get mixed better which is what you want.
If you're not using that method, turn all the cards in your deck the same way. On the back, take a Sharpie and mark a dot along the edge where the right-side up top of the card would be. Then, when you shuffle, you can turn some of those dots so they're facing the other direction and you'll get mixed normal/reversed cards. Just don't play poker or blackjack with these. (IMG:
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Does that help?
This post has been edited by Darkmage: Mar 8 2010, 04:15 PM