The DS Card Fighters game isn't that good. Three reasons:
1. In the first game, you could just use cards whenever you wanted. In the DS game, they added energy cards so you must have enough of those to use your other cards. I didn't like that.
2. In the NGPC game, you could visit towns and other places to battle others in the main story mode, but in the DS game, you're just climbing a tower.
3. And this is the big one. There is a game breaking bug that keeps you from progressing, and there's no way to avoid it on the DS game.