Like most Pokmon cards, the value of Mewtwo-EX depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (BW Black Star Promos)
Suddenly, it is a lot harder for Illumineers [players] to remove a bodyguard like The PrinceNever Gives Up by simply challenging it
It looks like there will be quite a few Pirates in the metagame that this Pan can deal with efficiently
Credit: Wizards of the Coast Pair o' Dice Lost FromTheShire: Instant speed recursion is nice even if it is variable, and this is great for picking up a bunch of fetches, Lotus Petals, and Dark Rituals
Once you establish an overwhelming force, you can finish the opponent with cards like Overrun and Master Biomancer, or crush your opponent with sheer numbers as long as you can build up steam
Based on my (admittedly raw) data that I did spend a day with prior to editing my piece and massaging my numbers, you can see that I use the first three targets around 80% of the time