Why did they never make a Card Captor Sakura card game, anyway? You would think that at least Weiss Schwarz would have gotten on this by now...
Because it's going to be weird?
Example: if you took it KH-style, battling the cards you'll need to implement mobs and minibosses (which doesn't fit the lore) and more areas. - Take it card battle style: need to implement mob npcs to battle you. - Take it Aikatsu style: wtf? - Take it pokemon style: needs to create even more spirits/creatures/whatever those cards be - Take it dating sim style: There's only Syaoran as love interest...