iT's A dRAgoN
This monster has seen spots of play since its release in 2012. It formed part of a Firewall Dragon FTK in 2019 when combined with Danger monsters.
Grapha, Dragon Lord of Dark World
Best known for its role in long combos due to its ability to reset face-up cards, in the anime, this card's effect was not once per duel. It wasn't even once per turn.
Blackwing - Zephyros the Elite
Brutal Dozer, Anchor Drill, Tunneler
Infinitrack
I don't think so. I ordered the Kung Pao Chicken with a side of soup" (5ds)
Jack Atlas
Warrior of the Dark Demon World, Dark Sword
Dark Blade
The original pay 8, feel great
Qliphort Scout
In life, this was once Suanni, Fire of the Yang Zing
Shaddoll Dragon
Predaplant Darlingtonia Cobra
Rion, Citree, Phoenix
Crystron
"If you need more info, just look in the official handbook under the heading, 'How'd I Lose?' (GX)
Jaden Yuki
Gargoyle Powered
Boasting an easy $30+ price tag on release in a side set, due to it being an important card in its deck, this monster and the rest of its archetype taught players the difference between applying effects and activating cards. (It's also the only one of its archetype worth thirsting over)
Darklord Ixchel
This relatively new link monster received some hype on its release, due to its ability to effectively reset once-per-turn effects.
Worldsea Dragon Zealantis
2018 Pendulum Magicians played this monster as a free body for Heavymetalfoes Electrumite.
Abyss Actor - Curtain Raiser
Templar, Gallant, Veteran
Igknight
"Why don't you make like a heart and beat it!" (Zexal)
Yuma
Wyvern Warrior
Alligator Sword
Boasting one of the highest ATK stats of any main deck monster, this card was never the boss monster of its archetype. Instead, it was used as a searchable way to summon its archetype's true boss monster, which itself is a popular card in Edison Format.
Machina Force
In the TCG, this monster functionally has no effect. In the anime, it retained the piercing effect its original counterpart had (though in its appearance, it breathed fire, not a laser beam).
Malefic Cyber End Dragon
Currently saddled with a once-per-duel restriction, this card, when combined with revival cards, used to generate huge amounts of free advantage, in decks from Monarch to TeleDAD.
Destiny HERO - Disk Commander
Thief, Transporter, Helper
Superheavy Samurai
"The sooner I beat you, the less bad dialogue I have to hear" (Gx)
Adrian Gecko
Wild Raptor
Uraby
Released in Cybernetic Revolution, this spell card appeared in side decks during the latter half of ARC-V due to the prominence of Kozmo and ABC.
System
This is one of only two monsters in the entire game that can only be special summoned from the deck. Coincidentally, both of them require the same card to be summoned.
Red-Eyes Black Metal Dragon
As of April 2023, this is the only link monster with a once per duel effect
Scareclaw Light Heart
Soul, Amazing, Storm
Pendulum
"She'd be my type if she knew what a sandwich was" (Vrains)
Cal Kolter
Cluck
Niwatori
Based on one of the most infamous monsters in early Yugioh, this card, which arguably has a better effect, appears as a sort of wincon in an janky Edison deck.
Sky Scourge Norleras