It would be nice if you could make a deck for your opponent, and play against it with your one.
The deck would be controlled by the AI, or by yourself, depending on what you want to do.
I know, this would be many rights for the user and some work.
Advantages:
- better testing of decks and bugs. If you find a bug and have no screenshot of it, you can better reproduce that situation.
- new way of playing the game.
- new kinds of challenge possible.
- you can better show special game situations and talk about it.
- games against yourself possible ( is that interesting?)
- games on a single PC possible with 2 players.
Disadvantages:
- Players don´t play the real game as much as now ?
- Long time motivation goes up or down ?
- some I can´t imagine now.
Edit (12.3.2011):
Although a bit late, this idea has come into the trainer, although it´s probably not because of this thread.