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Mine Mystique
Mystic Mine
An extremely annoying Fusion Monster often played to bolster bad decks.
Red-Eyes Dark Dragoon
The absolute scariest monster from Light of Destruction
Judgment Dragon
Most of the time, this card will have 1800 ATK, not 2400. It provided non-destruction monster removal for one of the first successful Pendulum decks.
Qliphort Carrier
Because Graceful Dice's anime effect only worked on monsters with 500 or less ATK, this was Joey's target of choice.
Swordsman of Landstar
Pot de Cupidité
Pot of Greed
This is a powerful utility card and was also a degenerate FTK enabler. Some people consider it a budget alternative to Accesscode Talker
Topologic Bomber Dragon
This was the first Ritual Monster to be limited
Demise, King of Armageddon
This is the younger cousin of one of the best monsters (for the modern format) from Cyberdark Impact.
Majesty's Fiend
In addition to Jinzo, Espa Roba also gives this card to Joey.
The Fiend Megacyber
Héritage du Monde - "Baguette du Monde"
World Legacy - "World Wand"
This card is named after the attack of a major monster from the DM anime.
This card has the highest discard cost in the game
Final Destiny
This was the second ever Ritual Monster to be limited
Evigishki Gustkraken
This is one of the oldest banned monsters, with one of the most insane effects ever printed, both from a gameplay standpoint and from a tournament policy standpoint.
Fiber Jar
Dragon Arc-en-Ciel
This was the first LV monster that could not be summoned using "Level Up!"
Winged Kuriboh LV10
There are two cards that can banish all cards your opponent controls with a single activation of their effect. One of them is competitively viable. This one is not.
This card can be used to buff your weak monsters, or as situational removal for your opponent's strong monsters. It was a staple in the Cybernetic Revolution sealed format.
Cybernetic Magician
This Trap Card was not released in the TCG until 2016, many years after its debut in Duelist Kingdom against Bandit Keith. When it was released, its name was different from in the anime, to ensure it belonged to the correct archetype of Trap Cards.
Trap Hole of Spikes
Jambe Gauche de l'Interdit
Left Leg of the Forbidden One
According to card set number, this is the second Secret Rare from Dark Crisis
Judgment of Anubis
This monster was misprinted without its summoning condition in its first TCG release, making it much easier to use.
Ocean Dragon Lord - Neo-Daedalus
This card has the stats of a Monarch and is actually a part of the Monarch series, but its name in the TCG does not include the word "Monarch."
Tenmataitei
Joey uses this card only once. This was one of the best tribute monsters in early Yugioh, but did not release in the TCG until late GX.
Cyber-Tech Alligator