
Sorcery
Choose odd or even. Exile each creature with mana value of the chosen quality. (Zero is even.)
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You 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.
If a creature on the battlefield has in its mana cost, X is considered to be 0.
The 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.