Making a trading card game in any game-engine is pretty complicated. I can’t say I’d choose Blender to do it unless you’re really looking for a 3D representation. I started one several times using GameMaker. It’d be pretty cool to see something like this done in Blender though it would certainly stand out if it’s well done.
I used to be a big fan of the Yugioh Trading Card Game when the show was still on the air. Magic: The Gathering was fun too, but I never had any decent cards lol
The hardest part about programming a card game for the computer like that is going to be the rules of the cards… each card does something very specific and will need to be programmed to deal with all possibilities… which is a sheer nightmare.
It’s probably a lot easier to do a free style version where players simply play the cards and control everything themselves, but that would amount to nothing more than a virtual representation of the cards on the computer… not much of a game.
If you were planning your own original trading card game though you could maybe start very simple and release early versions of the game with only a few cards and then add cards as you go. But basically you’ll have to program each individual card’s rules into the game and account for every possibility that could occur… it’s a hell of a lot of work. lol