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This card, for a long time was considered to be the most powerful card in the game. Until it was release from the banlist when Konami nerfed it’s devastating effect.
Chaos Emperor Dragon
This cute and cuddly archetype devastated the Meta as a tier 0 deck
Fur Hires
This human-shaped animal with wings is beautiful to watch but deadly in battle.
Harpie Lady
Battle Ox
Enraged Battle Ox
The most popular alternative format in recent history
Edison Format
These two cards were considered to be the most powerful searchers until restrictions were added to their effects.
Sagan and Witch of the Black Forest
Due to its ability to easily summon a big monster and run many stun cards. Some could consider this to be the Eldich of Duel Links
Shiarnui
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Quilport Scout
Celtic Guardian
Obnoxious Celtic Guardian
Although, technically not the first tier 0 format (referring to Yatalock). It’s still considered the best deck of all time by some boomers.
Tele-DAD
Being an generic Syncro that dominated its Meta, this card showed all players why the “Once Per Turn” clause should exist.
Dark Strike Fighter
Played usually as Tea. It only makes sense that this deck matches the hatred for Tea herself.
Tea Burn
Finally got to visit that harbor specializing in Gunkan Suships that I've been curious about for a while! The premium "Shari" here is limited to 2000 Suships a year, and uses specially developed smooth aged rice, giving it extra boldness not found anywhere else. The classy atmosphere made my heart sing, too. The Gunkan Suship served had a perfect balance of vinegar, nigiri, shine, and shape, demonstrating exquisite artisanship. The owner told me, "We are introducing rich yet mellow scented EDO-FRONT red vinegar in the near future," which I'm really looking forward to. However, I was disappointed the surrounding seas were a little noisy... so, giving it 4 stars with hope for improvements in the future!
Gunkin shuship Shari
Mystical Elf
Mystical Elf - White Lightning
Summon, tribute, Summon 2, ???, Burn for game.
Rescue Cat Format
This card's text was first shown in a Japanese magazine scan, its last sentence used the word "If” before it was change to “When” upon its official release. The change was likely made to prevent a potentially disastrous FTK loop.
Light Pulsar Dragon
Although it relied on your opponent having certain cards face up. This deck's ability to pop cards and search made it a top contender.
Aliens
A very small dragon known for its vicious attacks.
Petite Dragon
Dunames Dark Witch
Power Angel Valkyria
Although hated by most. This format is regarded by many players to have one of the most skillful mirror matches, in regard to only one of the best decks at the time.
Dragon Ruller/spellbook Format
The most powerful 1 tribute monster in the early stages of yugioh, would lose It’s title after an restriction was added to its effect.
Fairy King Trusdale
Played by a cheater in the anime, this top deck gave a lot of trouble during the battle phase.
Amazons/Amazoness
With its sound-baffling armor and gargantuan jaws, this primeval predator's phosphorescence was the only possible pardon for its primitive prey.
Megalosmasher X
Gyakutenno Megami
Goddess of Sweet Revenge
This format was known for having two different versions of a meta relevant deck. Some players even played a transition side, in order to play both versions.
PC Monarchs