Carnot the Eternal Machine [PHNI-EN024] Quarter Century Secret RareSet: Phantom Nightmare Card type: Effect Monster Rarity: Quarter Century Secret Rare Attack: 3000 Defense: 2500 Cannot be Normal Summoned Set. Must first be Special Summoned (from your hand or GY) during a Duel in which your opponent has activated a monster effect in their hand or GY. You can only Special Summon "Carnot the Eternal Machine" once per turn. Once per turn, if your opponent activates a monster effect (except during the Damage Step): You