Two separate hoops to jump through is never a good feeling
So you have to think about how you balance between building your board and being aggressive to chase knockouts
Deck is not meta for sure but when it works it REALLY works
Each card is handpicked to create a symphony of destruction that will leave your opponents wondering if they wandered into a dragon's den by mistake
Its an artifact token generator, a card draw engine, a cast-from-exile enabler, and just a fine reward for hitting opponents (AKA breaking faces)
The main reason you'd use this card in a deck is for Mewtwo's second move, Damage Change, ideally each time your opponent brings a new Pokemon into the active Pokemon spot you would want to use Damage Change and not only remove all damage from Mewtwo, but receive zero damage in return, then after that you could either retreat Mewtwo or use Shatter Shot for a few turns