The implication is that Mewtwo's raw abilities were powerful enough that even its creators felt the need to dampen them before they could be used safely
Skullclamp should be in practically every token deck, but white gets its own neat sacrifice outlets like Martyred Rusalka and Fanatical Devotion
And if youre killing your own creatures a lot, you may as well take advantage of that too
Illustrated by Dan Murayama Scott Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Not Legal Comp
Double-faced cards that can be cast on either side are MDFCs, or modal double-faced cards, which don't use the transform mechanic
Main deck removal is a question that you will have to consider, and decide what configuration you want to use, so you dont necessarily get run over by the fastest aggressive strategies