I know I've said this before, but just so it has its own topic:
How about a 'game log', that records what cards are played, which slots creatures go into, which creatures/permanents are targeted, who by, and possibly even a feature that, if you put the log into it, would play the game agian, as if you were spectating. If the last bit was put in, I suppose the raw output would be as some sort of code that is readable by the game, then can be either translated into english, or replayed. Or both, obviously.
