Some Yu-Gi-Oh cards are very powerful - we've all had games that have ended simply because your opponent had one incredible card up their sleeve. Some cards, however, are so powerful that Konami won't even allow you to use them at their full power in official tournaments - these are the cards on the Forbidden and Limited Lists.
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There are three lists: Forbidden, Semi-Limited, and Limited. Each category places different restrictions on the number of copies of a certain card you are allowed in your deck. Players rarely reference each list individually, and instead talk of the collective banlist, an amalgamation of the three lists. This may be confusing at first, but don't worry - it'll all be explained here.
The first list is the Forbidden List. Cards on here are banned from any tournament-legal deck outright - you can't even play a single copy. This list is usually the largest of the three, since over the years many cards have been printed that would provide incredible power creep even from a single copy. Among other things, this is down to meta decks' capabilities to search out their combo pieces with impressive consistency, so much so that grabbing one copy of a card from the deck is often much easier than playing three copies and hoping you draw one.
Next up is the Limited List. Each card on here is technically tournament legal, although you can only play one copy of each in your deck, Side Deck, and Extra Deck combined, compared to the usual three you are allowed. You might be wondering why this is relevant given what was said above, but, in fact, this list is incredibly important. Rather than taking away key archetypal pieces from overpowered strategies, it often serves to
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