The Labyrinth of Nightmare promotional cards are two Secret Rare cards, "Metal Reflect Slime" and "Torrential Tribute", that could be obtained by exchanging a coupon on the front flap of the box lid for the Labyrinth of Nightmare re-release in South Korea.

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Card numberEnglish nameKorean nameRarityCategory
LON-KRPR1"Metal Reflect Slime""메탈 리플렉트 슬라임"Secret RareContinuous Trap Card
LON-KRPR2"Torrential Tribute""격류장"Secret RareNormal Trap Card
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Angmong-ui Migung peulomosyeon kadeu +
악몽의 미궁 프로모션 카드 +
Official +  and OCG +
Labyrinth of Nightmare promotional cards +
Set page +