The downside of playing Mill is that all of your cards do nothing until the opponent diesI can't count the number of times I've ended up two or three cards short of milling the opponent's library when I died
I thought about going with Dragons and using the two megamorph dragons that put +1/+1 counters on all of my other Dragons when they are turned face up, but both the Blue and Green ones are just 4/4s
Here is what Mewtwo can do that most Pokmon simply cannot
These are not ones for you like Big Score, but foes
The more packs you crack, the more accurate the EV will become because you will smooth out these outliers
Just like how those clamouring for Hogaak, Arisen Necropolis or Faithless Looting to get banned in Modern a couple of months ago should have been registering the deck all along, if you want to win and genuinely believe a card needs banning in Pioneer, then you should be playing it and trying to break it