Reprinted 6x total, including once in the last 2 years.
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Extinction Event
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Oracle Data
Official Judge Precedents
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.
If a creature on the battlefield has 
in its mana cost, X is considered to be 0.
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.
