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. Here are some examples:

Example 1

The cards "Harpie Lady", "Cyber Harpie Lady", "Harpie Lady 1", "Harpie Lady 2", and "Harpie Lady 3" all state that their name is also "Harpie Lady", therefore they all share the same card name "Harpie Lady", so you can only have a maximum of three between these card names. 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, but not in the Main Deck, so you can have three copies of this card, in addition to any legal combination of the above cards.

The rule also applies to "A Legendary Ocean". Its card effect 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

"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 when building the deck; therefore, you can have three copies of "Cyber Dragon" and three copies of "Proto-Cyber Dragon" in your Main Deck.

Example 3

In the above cases, a player may theoretically have up to three of each card above in their Deck. These cards are seen as Retrained from the original version.

Example 4

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