* Print Run: Some cards were printed in extremely limited quantities, like promotional cards or those given out at specific events.
* Condition: A card's condition heavily influences its rarity. A pristine, mint condition card will be much rarer than a heavily played or damaged one.
* Edition: Different printings of the same card can have varying rarities, with early editions often being more sought after.
* Demand: A card's popularity and collector interest can also influence its perceived rarity.
However, here are some cards that are often considered among the rarest:
* "The Legendary Exodia" Set: This set of five cards is notoriously rare, especially the "Exodia the Forbidden One" card, as it was only available in the "Legend of Blue-Eyes White Dragon" set.
* "Super Secret Rare" (SSR) Cards: These cards were initially printed in limited quantities and are highly sought after, especially from the older sets.
* "Gold Secret Rare" (GSR) Cards: These cards were introduced in the "Magician's Force" set and are extremely rare due to their limited print run.
* "Ghost Rare" Cards: These cards were initially introduced in the "Duelist of the Roses" set and have a unique holographic effect. They are highly collectible and rare.
* "Limited Edition" (LE) Cards: These cards were printed in limited quantities and are often given out at special events or tournaments.
Ultimately, the rarest Yugioh card is the one that's most difficult to find in good condition and is highly sought after by collectors.