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(They each put the top card of their library into their graveyard.) : Each player mills a card

In Commander, its even better because 2-mana counterspells arent considered slow, and the turns when you get to counter a 6-mana spell and follow up with your own 7+ mana spell are devastating

Thats massive if the energy deck can stand to add graveyard synergies

However, there are some variants in Mythical Island, and you can experiment with those variants if you want to

(Monsters with a Cubic Counter cannot attack, also negate their effects.) 1 2

According to the CGC Cards Population Report, CGC Cards has graded just one Shining Mewtwo a CGC 9.5, with 15 graded higher