Yea I like that idea of the QR code leading to more games.
I don't know how to do any magic tricks but I thought it might be a cool trick to use the guillotine, the Jack of Clubs and the Jack of Hearts in a trick. Note: The Jack of Clubs is holding the Jack of Hearts head.
Maybe have something like guillotine normal and then one with the Jack of Hearts head on it and then a Jack of Clubs holding the head and not. Then a Jack of hearts with his and without.
I don't know, something along those lines, I can make both sides of the cards whatever I want. If someone comes up with an awesome magic trick, I would be happy to work with you.
Well, here's a way to get your trick idea out there - and by the way, it's a good one! - as well as having everything else you want.
Of your two jokers, print one with the chopped Jack of Hearts head in the basket, perhaps some rivulets of blood running down the blade of the guillotine. For your "standard" Jacks of Hearts and and Clubs plus the two remaining cards, you print:
Jack of Clubs empty-handed,
Jack of Clubs holding Jack of Heart's head,
Jack of Hearts "normal" and
Jack of Hearts beheaded.
Then for the QR code, you can place it on the bottom or sides of the box, or on the inside if you want to get fancy. Some people have the tuck box interior printed (it costs extra but looks nice) and occasionally I've seen a card reveal printed in there as well. It's great, because unless you're performing for a deck collector, no one expects ANYTHING to be printed inside the tuck box. If you are going through the expense, place the QR code high on the inside of the front of the box with a note about finding extra games online at a mobile-friendly website and print a reveal in the box flap. A card reveal can be ANY card - the idea is for the magician, using sleight of hand and distraction, to make the spectator feel like they had a fair choice when in fact that particular card was forced upon them to pick all along.
For your trick, changing out the two cards could be tricky, but a more novice magician could simply use only one of them if he or she chose to. It's actually a pretty ingenious idea, one I personally haven't seen before. Plus, it could be the first deck ever where you could declare no-eyed or four-eyed Jacks wild!