Main Deck

Main Deck
A Main Deck in the anime
Japanese (ruby)	メインのデッキ
Japanese (romanized)	Mein no Dekki
English	Main Deck
Other names French: Main Deck German: Main Deck Italian: Main Deck Korean: 메인 덱 Mein Dek Portuguese: Deck Principal Spanish: Deck Principal Traditional Chinese: 牌組 Páizǔ / Paai4 zou2

The Main Deck (Japanese: メインのデッキ Mein no Dekki), usually simply referred to as the Deck (デッキ 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

TCG/OCG

• The Main Deck must contain only Legal cards.
  • Extra Deck cards cannot be placed in the Main Deck.
  • Token Cards are not placed in any Deck.

Master Duel

Constructed Deck format

• The Main Deck must contain 40 to 60 cards.
• Up to three copies of any Unlimited card can be included across the player's Main Deck, Side Deck, and Extra Deck (combined).
  • Up to 1 of each Limited card and up to 2 of each Semi-Limited card may be included in the player's Decks. Forbidden cards cannot be included.
  • Cards which have their name permanently treated as a different name are considered to be the same as that card for deck construction. Cards that are permanently treated as multiple names are counted as both names.

Sealed Format

• The 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.
• There is no limit on the number of cards with the same name that can be included in the player's Decks.

Speed Duel

• The Deck may only contain cards with the Speed Duel Logo.
• Up to three copies of any Unlimited non-Skill Card can be included across the player's Main Deck, Side Deck, and Extra Deck (combined). Additionally, the player can include up to one Skill Card with their Deck (although Skill Cards are not placed in a Deck).
  • Up to one Limited 1 card (in total), two Limited 2 cards (in total), and three Limited 3 cards (in total) can be included in the player's Decklist, including their Skill Card.
• 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.

Yu-Gi-Oh! Rush Duel

• The Main Deck must contain only Yu-Gi-Oh! Rush Duel cards.
  • Fusion Monsters cannot be placed in the Main Deck.
• The Main Deck must contain 40 to 60 cards.
• A Duelist may not have more than three copies of any Unlimited card included in their Main Deck, Side Deck, and Extra Deck combined.
  • If a Forbidden, Limited, or Semi-Limited List is used, the number of copies must not exceed those requirements.
• The Main Deck and Extra Deck combined can contain a maximum of 1 Legend Card of each card type (Monster, Spell, and Trap).