If you toss 15, would you rather draw 15 or put 15 mana value dorks onto your battlefield
Unlike other cards, you may have any number of Basic energy cards in your deck
FromTheShire: Well if you have 7 mana and a grip full of cards this should certainly win you the game if you're teched for it

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But ok, that's kind of a gimme
The artwork is spectacular, depicting Mewtwo under the control of Team Rocket in a composition that channels the character's tortured origin story with cinematic intensity