Today I thought I would search around on eBay. I've been meaning to buy Gradius 2 for awhile so I checked to see what auctions were going on. Then I probably found the last thing I would expect. A Yu-Gi-Oh card with the option from Gradius.
I thought this was pretty interesting. I thought Konami merely published the cards. I never thought that a cameo from a Konami game would find its way on a card. Pretty cool right?
There was a thread on the shmup forum (not the one here) about this a while back. They have a bunch of different cards with shmup based pictures, function, and/or title.