El Shaddoll Apkallone
For a long time, this was the only fusion monster to be placed on the forbidden list
Thousand-Eyes Restrict
When your opponent activates a Spell/Trap Card, while you control a Machine Ritual Monster (Quick Effect): You can detach 1 material from this card; negate the activation, and if you do, destroy that card.
Drytron Mu-Beta Fafnir
Infinite Impermanence
Ghost Girl/ Emma Bessho

Father of the Aesir
Odin, Father of the Aesir
ABC - Dragon Buster
Arguably the most well known WATER searcher, this card spent nearly 2 years limited from 2013-2015
Atlantean Dragoons
This card was forbidden due to its ability to draw dragon rulers a fresh new hand after a full combo, or more, if it drew into itself.
Super Rejuvenation
If an opponent's monster in the Extra Monster Zone is destroyed by battle, or leaves the field because of your card effect, while this card is in your GY: You can Special Summon this card, then you can negate the effects of 1 face-up monster your opponent controls, until the end of this turn.
Sky Striker Ace - Roze
Goyo Guardian
Officer Trudge
The Master of Beasts
Alpha, the Master of Beasts
Commonly played during link-heavy formats, this monster has affectionately received the nickname "Thanos"
Fantastical Dragon Phantazmay
Any deck gains access to Cyber Dragon Infinity so long as they can make this monster first
Cyber Dragon Nova
This card was banned for its role as the win condition in the Substitoad FTK
Mass Driver
Once per turn, during either player's Main Phase, if this card is in your Graveyard: You can discard 1 "Monarch" Spell/Trap Card, then target 1 monster in your Graveyard with 2400 or more ATK and 1000 DEF; add it to your hand.
Erebus, the Underworld Monarch
Yata Garasu
Noah Kaiba

Dragon Ruler of Pebbles
Reactan, Dragon Ruler of Pebbles
Modeled after one of the most powerful spells of early Yu-gi-oh, this card is most commonly associated with Lightsworn to recycle the many monsters you put in the graveyard, usually Judgment Dragon
Monster Reincarnation
Most commonly seen in OCG orcust decks, this card was printed with an error in the TCG that was fixed with its reprint in Battles of Legend: Armageddon
Topologic Zeroboros
Of the two plant monsters banned for the Topologic FTK, this one was the more recently banned
Samsara Lotus
If the activation of this card in its owner's possession was negated by your opponent's card effect and sent to your GY: You can discard 1 card; add this card to your hand
Double Evolution Pill
Tyranno Hassleberry

Shadow of the Six Samurai - Shien
Originally a TCG exclusive, this link monster saw some play in Orcust due to its excellent type and attribute, ease of summoning, and ability to get orcust monsters out of your hand
Barricadeborg Blocker
Released alongside the first gadgets, this monster's only reprints have come in structure decks
Ancient Gear Engineer
Featured in the 2012 Exodia deck that made it to worlds, this card is specifically designed so that while you can never win, you can never lose either.
Self-Destruct Button
Gains 1100 ATK if you control no other monsters.
Abyss Actor - Curtain Raiser
Painful Choice (2 answers accepted)
Chazz Princeton/Gozaburo Kaiba
Karakuri Shogun MDL 00
Karakuri Shogun MDL 00 - Burei
Although never touched in the TCG or OCG, this card is always banned whenever Worlds comes around
Rainbow Life