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At the beginning of your upkeep, you may put a soot counter on Smokestack.
At the beginning of each player's upkeep, that player sacrifices a permanent for each soot counter on Smokestack.
Adding a counter is optional. If you forget to add one during your upkeep, you cannot back up and add one later.
If a player does not have enough permanents, they sacrifice all the ones they have.
