Limited

In the OCG and the TCG Advanced and Traditional Formats, Limited (制限 Seigen, "Restricted") cards are cards that players are allowed only one copy of in their Main Deck, Side Deck, and Extra Deck combined.

These cards are Limited as of April 1, 2014 for both the OCG and the TCG Advanced Format.

Anime\Manga
During Battle City it is said that players can only have one copy of Monster Reborn in their decks.