|Card type||Spell Card|
LoreTarget 4 "Emmissionary" cards in your GY; shuffle them into the Deck, then draw 1 card. If an "Emmissionary" Xyz Monster(s) you control would be destroyed, you can attach this card from your GY to 1 of those monsters as a material instead. You can only use this effect of "Carnot Cycle" once per turn.
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