If you’re a fan of collectible card games, or card games in general, or Magic the Gathering specifically, check out mtgplay.com. How these folks are able to offer this when there’s a commercial online service that enables Magic the Gathering play I don’t know, it seems to be clearly in violation of copyright for the card art scans at least, but draw your own conclusions (and cards). Win32 only I’m sorry to say, though it would probably run ok under emulation on a mac.