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401. Exhaust

401.1. Exhausting is an action that marks a non-spell Game Object as "spent."
401.2. "Exhausted" is a state for Game Objects that other game effects and rules can reference.
401.3. This is a Limited Action.
401.4. When Exhausting is listed as a Cost , then the Action must be able to be completed for the cost to be paid. Example: A spell says "As an additional cost to play this, you may exhaust a friendly unit." An exhausted friendly unit may not be exhausted again as the additional cost for the spell, and the additional cost has not been paid.
401.5. In abilities, the Exhaust symbol represents the cost "Exhaust this" or "Exhaust me." It resembles a card turning sideways.