self vs self battles don't work for me because you already know the cards that your playing against and the tactics your gonna use for the other player, so it's not a very good simulation...
Actually winning against someone who knows all your moves is mark of any good player. Any player on any game will always try to know what is coming so playing against yourself is the best way of improving your game. I do this to test team and card combinations and this will give you a good idea on how to play your team and cards properly.