You have to accept the risk of drawing multiples, but since up to two is acceptable, I don't think it's much of a problem
First off, consider that by starting to proxy, youre essentially making the first move in an arms race. Now, its not that arms races dont exist outside of proxying
Set up is really important in this deck, and Crispin does that, akin to Sonia in the glory GLC days
The protective finish also helps prevent everyday wear and fading
Counter target noncreature spell
Zapdos doesn't quite double up Mewtwo's value, but you can see the major impact that the artwork and each Pokemon's visibility have on the price of the best Pokemon Rumble cards