The current version of the Mewtwo deck does not require or even
need the opponent to draw cards off your mulligans. Also the deck
prefers to go first, in fact, to set up the lock before opponent can go
off. It uses trainers such as Maintenence, which shuffles cards back
into the draw pile, and Imposter Prof. Oak to reshuffle opponent if he
has 6 or less cards (thus reducing opponent's draw pile) to help deck
the opponent. And in Fossil, there are trainers that help the deck,
such as Recycle.
      Imposter Prof. Oak is not a threat to the deck. There is not
going to be a sideboard (DCI Pokemon Floor Rules), and no one is going
to use Imposter Prof. Oak main deck. It's just not going to happen.
It's a dead card against every other deck.
      Poliwag is not that good a solution, because if Poliwag uses
Amnesia, then Poliwag will get killed by Mewtwo's Pyschic attack (which
would deal at least 30 points of damage, and Poliwag has 60 HP). Two
turns of Amnesia is very unstable, but maybe Rain Dance can solve that.
 
The Mewtwo Deck
2 Mewtwo
3 Maintence
2 Imposter Prof. Oak
53 P. Energy
                          -Bill "The sun is on fire!" Wong
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