Players might say this card is bad now, but it changed the way people play combo, counting summons and making boards to negate this card first before extending.
Nibiru, the Primal Being
This monster breaks the rules of extra deck summoning to summon her lover, Dante
Beatrice, Lady of the Eternal
Part of the one of the most successful 5ds archetypes, this card was one of the first to be released, alongside its partners in crime, Gale, Sirocco, and Armor Master
Blackwing - Bora the Spear
This ATK-modifying trap card sees some occasional play as a one-of in its deck, but compared to its two spanish counterparts, it's not worth the investment.
Guardian of the Golden Land
This card powercrept its fellow Number 101 due to its ability to shuffle back any card on the field. It's also part of an archetype, though that has never mattered.
Castel, the Skyblaster Musketeer
Salamangreat Gazelle
Mekk-knights made players care about columns, but this card forced players to respect backrow lest their columns get negated.
Infinite Impermanence
First appearing in Yu-Gi-Oh GX, this spell card for Dinosaurs was brought into the TCG years later in Battles of Legend
Double Evolution Pill
This xyz monster saw play in Virtual World not for its effect but as an extra material for Divine Arsenal AA-Zeus - Sky Thunder
Gaia Dragon, the Thunder Charger
This trap card draws you two cards, but you're better off setting the card you have to discard to do it.
Paleozoic Pikaia
This trap card powercrept Sakuretsu Armor with an almost identical effect, but better payoff
Dimensional Prison
Galatea, The Orcust Automaton
One of the first popular hand traps, released in 2010, this card let players negate their opponent's monsters even if you didn't have backrow.
Effect Veiler
This machine fusion monster floats into one of its 3000 ATK materials when destroyed
Ultimate Ancient Gear Golem
This card doesn't inflict piercing by itself, but gives specific link monsters that ability instead
Crusadia Leonis
While most of its flip brothers are used in its deck, this card has remained on the sidelines, as the most it offers is changing battle positions or recycling
Shaddoll Hound
"I was part of a 1-card combo that made x-sabers top of the meta. Yaaay"
Rescue Cat
D/D/D Flame King Genghis
This card gave its name to one of the longest running tier 0 formats in the game's history
Dark Armed Dragon
This Ritual monster can cheat out Amano-Iwato from the deck
Shinobaroness Peacock
Recently receiving support, this card is part of a trio of DARK machines.
Cyberdark Horn
Summoning this WATER monster is a 5 card combo in and of itself. You're better off summoning this card's smaller counterpart, Abyssmegalo
Mermail Abyssbalaen
The Phantom Knights of Break Sword might be known for its effect to destroy two cards, but it was this synchro monster that had that ability first.
Scrap Dragon
Aloof Lupine
This card has lent its name to its kind of monster: giant beaters that are largely immune to all other card effects.
Apoqliphort Towers
Never played in its own stun-based deck, this card is a board wipe so long as you control two monsters from rival archetypes.
This card's ATK stat is absurd, rivaling that of Nekroz of Sophia and Super Quantal Mech King Great Magnus. However, it inexplicably halves its ATK whenever it attacks.
Super Vehicroid - Stealth Union
Part of an archetype with some of the best link monsters the game has ever seen, this card is, for some reason, level 9 support.
Astro Knightmare Idlee
Still seeing occasional play, though rarely at the competitive level, this card was commonly played as an easy way to out monsters unaffected by card effects since it didn't take up space in the main deck. Just punch them really hard
Number S39: Utopia the Lightning
Zefraath