輝月之力

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Rulings:

• 7/13/2016 You can’t choose not to sacrifice Lunar Force.
• 7/13/2016 You sacrifice Lunar Force even if the spell’s already been countered, perhaps by the ability of another Lunar Force, or if the spell can’t be countered.
• 7/13/2016 The spell will be countered even if Lunar Force can’t be sacrificed, most likely because it has already left the battlefield. Casting a spell in response to an opponent’s Lunar Force’s triggered ability is generally a bad idea.