Extinction Event
Sorcery
Oracle Text
Choose odd or even. Exile each creature with mana value of the chosen quality. (Zero is even.)Rulings (3)
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Wizards of the CoastThe mana value of a token that isn't a copy of another object is 0. A token that is a copy of another object has the same mana cost as that object.
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Wizards of the CoastIf a creature on the battlefield has
in its mana cost, X is considered to be 0.
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Wizards of the CoastYou choose odd or even while Extinction Event is resolving. Players can't take any actions between the time you make that choice and the time some creatures go extinct.