I expect Mewtwo EX to commonly be played as it's own deck early on, until people start to realize that it doesn't work.IMO, Mewtwo EX isn't going to be run as its own deck. It's going to be a powerful addition to almost every deck, but the card just doesn't function as a main attacker. MewBox can handle Mewtwo no problem, but its the other cards in the deck like Magnezone and Zekrom EX are going to give mew a hard time. I think mewbox'll be an alright deck and it definitely will win tournaments but it will be overshadowed by others.