This is a list of cards which have appeared within the various Yu-Gi-Oh! series, but have not been named.
Duel 009 cards
A number of Monster Cards that appear on the counter at Kame Game as Sugoroku explains the rules of Duel Monsters to Yugi and his friends in Chapter 9. The only ones with visible names were "Summoned Skull", "Hell-Bound", and "Giant Soldier of Stone". Another card from this scene appeared, labeled only as an "ally," as a character in the dice game included with Volume 3.
Yugi's Duel 010 cards
A number of unnamed monsters played by Yugi during his first Duel with Seto Kaiba in an attempt to stall his opponent's powerful "Giant's Might"-equipped "Battle Ox," including a bird/fishlike creature and a bald, tattooed figure. All are quickly destroyed by "Battle Ox."
Kaiba's Duel 010 monster
A magician-looking monster played by Kaiba during his first Duel with Yugi.
Yugi's Death-T monsters
A number of monsters played by Yugi during his final showdown with Kaiba at Death-T. The first three seen are all destroyed by Kaiba's powered-up "Saggi the Dark Clown," while the fourth appears in Yugi's hand. The second and third monsters seen are replaced by "Chimæra" and "Gremlin" respectively in the first series anime adaptation of the manga Duel.
Kaiba's Death-T monster
A turtle-like monster Kaiba played in Defense Position during his Death-T Duel with Yugi during the time his "Blue-Eyes White Dragons" are immobilized by Yugi's "Swords of Revealing Light." It appears in both the manga and the first series anime.
Yugi's round monster
A spherical, insect-like monster Yugi played in Defense Position during his Duel with Insector Haga in the manga.
Ventriloquist of the Dead's monster
A one-eyed monster played by the Ventriloquist of the Dead during his Duel with Yugi. It likely originally belonged to Kaiba's Deck. In the anime, in which Ghost Kaiba took place as Yugi's opponent, he used Mystic Horseman instead.
Mai's opponent's monster
During his final Duel with Yugi in the manga, Pegasus uses this monster along with "Dark-Eyes Illusionist" to Ritual Summon "Relinquished." "Relinquished" resembles a combination of "Dark-Eyes Illusionist" and this card. In the anime, Pegasus uses "Dark-Eyes Illusionist" alone for the Ritual Summon.
During his Duel with Esper Roba in the manga, Dinosaur Ryuzaki used this monster. Roba put it to sleep with "Mesmeric Control", before destroying it with "Jinzo". In the anime, it is replaced with "Serpent Night Dragon".
Battle City participants' monsters
Two generic Battle City Duelists were shown using these two cards, one of which is a dragon, while the other is a knight.
An aerial view of another Duel showed another three unnamed cards.
Nagumo's opponent's card
A pumpkin-headed monster of Pandora's that he sacrifices along with Yugi's "Beta the Magnet Warrior" by way of "Coffin of Dark Resurrection" to Summon "Dark Magician", in the manga. In the anime adaptation, he uses "Mystic Tomato" instead.
A card seen in Dark Bakura's hand during his Battle City Duel with Dark Yugi, in the manga. It is unspecified whether this is a Monster, Spell or Trap Card. It is hypothesized to be "Poltergeists", a card which is used by Dark Bakura.
Jaden's opponent's monster
This monster was used by an unnamed opponent of Jaden Yuki and was destroyed by Jaden's "Elemental Hero Bubbleman". This monster looks similar to "Elemental Hero Neos", Jaden's ace in the Yu-Gi-Oh! GX anime.
Koyo's opponent's monster
Aster Phoenix used this monster against Alexis Rhodes. It was destroyed by Alexis' "Blizzard Princess", allowing Aster to move the "Vision Hero Increase" in his Graveyard to this Spell & Trap Card Zone since he took battle damage.
Jim Crocodile Cook used this monster against Bastion Misawa. He Tributed it alongside "Spawn Alligator" to Tribute Summon "The Tyrant Neptune". The effect of "The Tyrant Neptune" makes its own ATK the combined value of the Tributed monsters. Its ATK here was 3800, implying that this card's ATK was 1600, since the ATK of "Spawn Alligator" is 2200.
Yu-Gi-Oh! ARC-V The Strongest Duelist Yuya!!
Planetarium Action Field
Bastion's fire dragon
A fiery counterpart to "Water Dragon" Summoned by Bastion in the first Yu-Gi-Oh! GX opening, Fine Weather Rising Hallelujah. Despite its prominent appearance in the intro, it never appeared in the series.
Amnael's meteor Spell
The Three Masked Knights
Boxing glove Trap
Hyakunin Isshu Field
A Field Spell Card used during the Friendship Games. The "Duel" held here is similar to a game of Karuta. This field was cut from the English dub, likely because of the difficulty of translating the Karuta-like "Duel" for western viewers.
Alito used an unnamed Spell Card to change his Warrior-Type "Battlin' Boxer Big Bandages" to Beast-Type. The card was neither shown nor seen, but his opponent Girag asked him why he "used that Spell Card" to do so. The card went unmentioned entirely in the dub.
Traditional Japanese style Action Field
Shogi Action Field
Chess Action Field
Quiz Action Cards
Stage Action Field
Castle Action Field
Junior Action Field
Illusion Action Field
Sergey's Action Card
- ↑ Yu-Gi-Oh! R Duel Round 1: "A Wicked Shadow!"
- ↑ 2.0 2.1 Yu-Gi-Oh! GX Chapter 1: "A New Hero!!Special One-Shot"
- ↑ Yu-Gi-Oh! GX Chapter 33: "Ultimate Hero!!"
- ↑ Yu-Gi-Oh! GX Chapter 49: "Syrus's Real Strength!!"
- ↑ 5.0 5.1 Yu-Gi-Oh! GX Chapter 58: "MacKenzie's Stealth Maneuvers!!"
- ↑ Yu-Gi-Oh! 5D's Ride 31: "Jewel Flare Dragon Stardust!!"
- ↑ Yu-Gi-Oh! ARC-V The Strongest Duelist Yuya!! Chapter 7: "The Opening of the Duel School Tournament!!"
- ↑ Yu-Gi-Oh! episode 196: "Sinister Secrets - Part 1"
- ↑ Yu-Gi-Oh! GX episode 44: "The Seventh Shadow Rider"
- ↑ Yu-Gi-Oh! GX episode 124: "Triple Play, Part 1"
- ↑ Yu-Gi-Oh! 5D's episode 24: "Duel of the Dragons, Part 2"
- ↑ Yu-Gi-Oh! ZEXAL episode 53: "Test Your Luck!"
- ↑ Yu-Gi-Oh! ZEXAL episode 81: "The Friendship Games"
- ↑ Yu-Gi-Oh! ZEXAL episode 133: "Vector the Victor"
- ↑ Yu-Gi-Oh! ARC-V episode 17: "Menu Venue: Part 2"
- ↑ Yu-Gi-Oh! ARC-V episode 19: "Quiz Quagmire: Part 1"
- ↑ 17.0 17.1 Yu-Gi-Oh! ARC-V episode 20: "Quiz Quagmire: Part 2"
- ↑ Yu-Gi-Oh! ARC-V episode 23: "A Date With Fate: Part 2"
- ↑ 19.0 19.1 Yu-Gi-Oh! ARC-V episode 38: "Warped"
- ↑ Yu-Gi-Oh! ARC-V episode 39: "Imperial Wrath Awakening"
- ↑ Yu-Gi-Oh! ARC-V episode 93: "Road Rage: Part 1"
- ↑ Yu-Gi-Oh! ARC-V episode 127: "Revival Zero"
- ↑ Yu-Gi-Oh! ARC-V episode 133: "A Dazzling Entertainment Show"