Carnot the Eternal Machine (Quarter Century Secret Rare)

Carnot the Eternal Machine (Quarter Century Secret Rare) was released in February 2024. Launch-week prices are left out here: before supply arrives they are mostly guesses. Over the past twelve months it moved −16.9%, trading between $12.97 and $19.19. The current price is in the middle of that range. The cheapest listing right now is $22.40, and the 30-day average market price is $15.27.

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 can make this card gain 1000 ATK. If this card is sent to the GY, except from the hand or Deck: Shuffle this card into the Deck.