Maximum of 3 Rule

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The Maximum of 3 Rule states that between your Main Deck, Extra Deck and Side Deck, you may only have three copies of one card of the same name.

For the purposes of this rule, cards that have a name name condition that always treat their name as a different name are counted as that alternate name. However, this does not apply to cards that are treated as having a different name in specified locations through an effect, even in the Deck (e.g. "Gunkan Suship Aka-Shari" and "Gunkan Suship Shari").

Example 1[edit]

The cards "Harpie Lady", "Cyber Harpie Lady", "Harpie Lady 1", "Harpie Lady 2", and "Harpie Lady 3" each have a name condition stating that their name is also "Harpie Lady". Therefore you can only have a total of three of these cards in your Deck. For example:

  • Three copies of "Harpie Lady", no copies of the others.
  • One copy of "Harpie Lady 1", one copy of "Harpie Lady 2", one copy of "Harpie Lady 3", no copies of either "Harpie Lady" or "Cyber Harpie Lady".
  • Two copies of "Harpie Lady 2", one copy of "Harpie Lady 3", no copies of either "Harpie Lady 1", "Harpie Lady", or "Cyber Harpie Lady".

"Harpie Queen", on the other hand, only has its name treated as "Harpie Lady" while it is face-up on the field or in the Graveyard, so you can have three copies of "Harpie Queen" in addition to any legal combination of the above cards.

The rule also applies to "A Legendary Ocean". Its condition states its name is treated as "Umi" at all times, so you can only have three cards in total between these two. You cannot have three copies of "A Legendary Ocean" and three copies of "Umi" in your deck.

Example 2[edit]

"Proto-Cyber Dragon" only has its name treated as "Cyber Dragon" while it is face-up on the field. It is not illegal to have more than three cards on the field with the same name; the rule only applies while the cards are in the Deck. Therefore, you can have three copies of "Cyber Dragon" and three copies of "Proto-Cyber Dragon" in your Main Deck.

Example 3[edit]

Some cards are similar in name and stats and depict the same monster. For example:

In the above cases, a player may have up to three of each card above in their Deck. While these cards may be styled as "Retrained" versions of the older card, they do not share the same name.

Example 4[edit]

Some cards that are stored in the Extra Deck have the same name as a card that exists in either the Main Deck or Side Deck: