MTGO stores all your matches, which you can find in the game history tab. But I have found myself curious what my record with a specific deck was after a high volume of matches, but it can be incredibly inconvenient to sort through if you played matches with other decks in between. I think it would be a useful feature if MTGO would allow you to toggle on or off a way to show you your record with a certain deck. Thank you for your consideration MTGO team.