During its more than two decades of history has Yu-Gi-Oh! The anime series has introduced thousands of cards to fans, each with unique abilities, strengths, and weaknesses. Audiences well remember the amazing and powerful classic cards that were introduced during Duel monsters era, when they followed millions of followers in the early 2000s.
Since then, each new series has taken it upon itself to increase the power level of the Monster, Spell, and Trap cards used by the heroes. The main characters in the several Yu-Gi-Oh! Anime shows have acquired tools that would make even the best duelists of the past cower in fear. These are the most broken cards ever used by the players of this beloved series.

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10
Supreme King Z-Arc
Z-Arc wasn't just the last opponent of Yu-Gi-Oh! Arc-V anime, as well as one of the most unhinged and ruthless villains ever, is also an extremely powerful monster. This card requires a lengthy setup to summon, but the results more than justify the trouble. By paying tribute to each of the four-dimensional dragons, using the effect of Astrograph Sorcerer, this mighty beast can rise again.

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As soon as this monster enters the field, all of your opponent's creatures are destroyed, dealing damage equal to their combined ATK. Z-Arc is also unaffected by the effects of other monsters as long as the Dimensional Dragons remain in the Graveyard or Banish Zone. Additionally, all other creatures controlled by the user cannot be destroyed either, making it a great final boss for one of the best Dragon-Type decks ever.
9
Numeron network
From time to time can Yu-Gi-Oh! anime would introduce villains who become so overpowered that fans still wonder how the heroes could defeat them. Don Thousand, the mastermind behind the Barian invasion, is one such antagonist, and there is no better proof than his Field Spell, Numeron Network. This card can be activated from the user's hand as long as they control no other cards and their opponent has just completed their Draw Phase.

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As long as this utility is on the field, the user can activate Numeron cards directly from their deck, giving them access to virtually their entire deck. This effect can be performed as many times as the user wishes, provided no other cards are on their field. It's a completely broken effect that's only tempered by it being specific to an archetype.
8
Role of Fate
Joey Wheeler is a duelist who had several great moments during the original series, despite being the least experienced player among Yugi's friends. His deck was never the most spectacular, relying heavily on luck and high level monsters. But whenever needed, Joey used powerful tools to win important games, such as the impressive Roll of Fate.

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This card has a simple but devastating effect, as it allows the user to roll a six-sided die and draw cards equal to the result. The only downside was that for every card taken from the deck, another must be sent to the graveyard. Still, with as many options for using monsters or other tools from the grave as Joey had, this was often more of an advantage than anything else.
7
Hundred eyed dragon
Synchro Summon, a method introduced under 5Ds era, has become one of the most useful tools a duelist can have in their arsenal. This type of monster has become so popular that many of the best Extra Deck Staples come from this unique group. Even if its real-life counterpart never got a chance to be a member of this list, Hundred Eyes Dragon's anime effect would have turned it into one of the best cards ever, hands down.

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After being summoned to the field by using two monsters as materials, this powerful monster will gain the effects of all Dark-Type monsters in the Graveyard. Since this card was primarily played as part of the Infernity deck, a popular and powerful Dark-Type strategy, this means that Kalin's signature monster can become an almost unstoppable force.
6
Pot of greed
Probably one of the most famous cards in the whole Yu-Gi-Oh! franchise, despite its popularity stemming from an old meme, the Pot of Greed has been the epitome of broken spells for more than two decades. This tool was quite simple, but all duelists hoped to see it as often as possible during gameplay. Once activated, this spell would allow the user to draw two new cards from their deck.

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In a game like Duel Monsters, which has no resource management aspect like many other of the very popular TCGs out there, this effect can be what wins a player a game. This card dominated the competitive scene for many years, as every deck contained at least one copy. Since then, it has remained on the banned list, and it seems that it will never be released.
5
Number 69: Heraldic coat of arms
Although it's not a fan favorite when they're on the air Yu-Gi-Oh! Zexal anime has become one of the most beloved series in recent years, with some fans considering it one of the best. Although not solely due to this, this fame is largely due to the Summoning Mechanic introduced during this era: XYZ. Several powerful monsters have been created around this idea, but none of them have been as powerful as number 69 in the anime.

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Using three Level 4 monsters as materials, the user could summon this mighty beast, which would not only negate the effects of all other monsters on the field, but also copy them for himself. If played after the opponent had established their board, it meant that number 69 would be a true nightmare to fight against. Worst of all, this card could only be destroyed by another number monster, making it nearly impossible to get rid of.
4
Number IC1000: Numeronius Numeronia
Throughout Yu-Gi-Oh! Zexal'Yuma and Astral, two of the best designed protagonists in the franchise, faced many powerful opponents, but none quite as menacing as Don Thousand. While his Numeron monsters were indeed extremely dangerous, it was his ace that caused the heroes the most trouble, this was none other than Number IC1000: Numeronius Numeronia.

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This card can be Special Summoned to the field when its previous form was destroyed by battle, making it fairly easy to summon. With an attack of 100,000 points, the highest in the series, nothing can quite match its power. One might think they're safe, since this monster can never declare an attack, but they'd be wrong, since its other two effects counter this limitation. As long as this monster remains on the field, opponents must attack it; otherwise they lose the duel.
3
Card of Holiness
Yugi Muto is not only the most popular of all the main characters introduced to Yu-Gi-Oh! series, but also one of the best players ever. While his skills as a Duel Monsters expert came in quite handy during the best duels in the original series, the King of Games was also aided by his unique and impressive tools, such as the spell known as the Card of Sanctity.

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This card, which had to be rewritten when brought into the TCG for being too competitively oppressive, allowed the user and their opponent to draw cards until they had 6 in hand. This means that, when used correctly, a player can replenish their entire hand at no extra cost. In a game like Yu-Gi-Oh!, with no limits on the number of cards you can play in a turn, this is an extremely unfair advantage.
2
Card of Demise
Seto Kaiba is known to be one of the most powerful and skilled rivals in the Yu-Gi-Oh! history, with a deck that can give even the King of Games a good challenge. As such, it's no surprise that Kaiba was able to acquire one of the most broken spells ever created, one so powerful that it had to be completely rewritten when it came to the TCG.

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Card of Demise is a card that allows the user to draw until they have 5 cards, with the supposed downside of having to discard their entire hand after 5 turns have passed. Although this limitation was harsh, Kaiba was never affected by it, as he often won his duels shortly after using the Card of Demise. As such, the spell becomes a powerful ride engine, with no side effects to punish the player.
1
Sabatiel – Philosopher's Stone
Besides drawing cards, one of the most powerful effects of a Yu-Gi-Oh! Spell can have the ability to search for any card in one's deck. By doing this, a player can not only maximize their strategy, but also acquire the necessary tools to defeat the opponent if they lose. As such, a card that can use this effect not once but three times can only be described as completely broken.
Sabatiel, a spell card used by Jaden Yuki during GX era, could be brought directly from the deck as soon as Winged Kuriboh was destroyed. Afterwards, this card would allow the user to search for any monsters, spells, or traps they might need directly from the deck, up to three times. If that wasn't enough, after the third use of this effect, the card would give a monster a power boost equal to the number of monsters the opponent controls at the time, a perfect tool for the best hero deck ever created.