I used to play Magic pretty heavily. Spent a few years creating a TCG. Had a thorough back story, commissioned artwork for the cards, had a heavily play tested mechanics system, everything was looking great until I find that Wizards of the Coast owns the patent on TCG's. Anyone that releases a TCG without clearing there play mechanics through Wizards runs the risk of getting sued for patent infringment. All attempts to contact Wizards were unreturned. Now I have a commercial grade TCG just sitting in my office, and I can't do a thing with it. Suffice it to say, I no longer play TCG's.