Main Deck

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Main Deck

Japanese (ruby)


Japanese (romanized)

(Mein no) Dekki


(Main) Deck

A Main Deck in the anime

The Main Deck (Japanese: メインのデッキ Mein no Dekki), usually simply referred to as the Deck (デッキ[note 1] Dekki), is a pile of cards that a Duelist can draw from during play. Each Duelist uses his or her own Main Deck in a Duel.

When constructing a Deck, Monster, Spell and Trap Cards are placed in the Main Deck. Fusion, Synchro, Xyz and Link Monsters are placed in the Extra Deck. If a player uses official Monster Token cards, these are to be stored in a separate location as well.

When a Duel begins, the Main Deck is placed face-down in the Deck Zone of the field. All cards in the Main Deck must remain face-down during the Duel (unless a card effect like "Convulsion of Nature" says otherwise). During a Duel, neither player may view the contents of either player's Deck unless a card effect allows them to, after which the Deck must be shuffled. Even if a card in the Deck is face-up, it cannot be looked at by either player unless it is on top of the Deck, in which case it is public knowledge.

Main Deck construction restrictions[edit]

Constructed Deck format[edit]

Sealed Format[edit]

  • The Main Deck must be constructed using only card product provided at the event.
  • The Main Deck can have a minimum of 20 cards. There is no maximum size.
  • A Duelist may include as many copies of any card he or she likes, even more than three.

Speed Duel[edit]

  • The Main Deck may only contain cards with the Speed Duel Logo.
  • The Main Deck must contain 20 to 30 cards.
    • Even in Speed Duel Sealed Format, the Main Deck must still contain 20 to 30 cards.[1]


  1. Sometimes written as "山札" in anime or manga.