Image via Konami
Yu-Gi-Oh has thousands of cards to choose from to build your deck. Unfortunately, with that many cards available, there are some cards that are unbalanced. It is possible for players to create decks that are incredibly overpowered. To remedy this, Konami has created a regularly updated list of forbidden and limited cards for official use.
There are three official classifications on the forbidden cards list. Forbidden cards are outright banned from use in any official games and tournaments. They cannot be in a player’s side deck, extra deck, or main deck. Limited cards can be used, but only one copy can be present in any of your decks. Semi-limited cards can also be used, but you are limited to two copies across all of your decks.