Here's a unique one. Pokemon TCG for Game Boy has 226 cards to use for making decks, and trading other Players (by GB Color's IR Port) with a Game Boy! You can battle other people, and learn new strategies by battling them (they pull fast ones though!), and you can earn new cards by winning against them! It has Base Set through Fossil along with some Promos, but there are also some other cards that have not, or will not, be(en) released by Wizards of the Coast. Can you earn the Legendary Cards? Are you up to the challenge? The game even comes with a Promo Meowth!