Not every rarity tier in a One Piece TCG booster set is about deck power, and OP-18's Special Card, Treasure Rare, and DON!! slots are a good example.
These three categories often confuse newer collectors because they do not follow the same logic as Common through Secret Rare.
OP-18 includes 6 Special Card, 1 Treasure Rare, and 1 DON!! card among its 127 total card types.
Here is what each of these actually is, and why they matter to completionist-minded collectors even if they rarely define competitive decks.
Special Cards in the One Piece TCG are typically premium-treatment inserts, often reprints or reworked versions of existing cards presented with unique foil or art treatments distinct from the set's standard parallels.
OP-18 includes 6 Special Cards, giving collectors a secondary chase tier below Secret Rare that is still meaningfully harder to pull than a standard Super Rare.
The Treasure Rare tier is one of the rarest and most visually distinct card treatments in the game, often reserved for a single standout card per set with unusually elaborate foil or texture work.
OP-18 includes exactly 1 Treasure Rare card, making it one of the hardest single pulls in the entire set purely by virtue of how few exist relative to the other 126 card types.
DON!! cards are a unique element of One Piece TCG gameplay, representing the resource system players use to power abilities and attacks each turn, and most sets include at least one special DON!! card treatment as a collectible rarity.
OP-18's single DON!! card rarity slot follows that same pattern, giving completionists one more specific card to track down alongside the set's other premium tiers.
Special Card, Treasure Rare, and DON!! slots exist to give collectors additional chase targets beyond the standard Common-through-Secret-Rare ladder, spreading premium-pull excitement across more of a box-opening session.
This structure also lets Bandai showcase different kinds of premium treatment -- reprints, texture-based foils, resource cards -- without overloading the Secret Rare tier itself.
With only 1 Treasure Rare and 1 DON!! card each in a 127-type set spread across 288 cards per box, both are genuinely difficult single-box pulls, comparable in difficulty to or harder than the set's two Secret Rares.
The 6 Special Cards are proportionally easier to encounter across multiple boxes, though still meaningfully rarer than the set's Rare or Super Rare tiers.
If completing a full rarity-tier set is your goal rather than deck building, the Treasure Rare and DON!! card are worth budgeting for as singles purchases rather than relying purely on box-opening odds.
Special Cards, being slightly more common at 6 total, are a more realistic target to encounter naturally across a modest amount of box openings.
Given how few of these cards exist relative to the rest of the set, anything you pull from the Special Card, Treasure Rare, or DON!! tiers deserves careful handling and storage from the moment it comes out of the pack.
Keeping the rest of your sealed product protected in the meantime preserves the overall collecting experience while you track down these harder-to-find pieces.
Some collectors set a specific goal of owning one copy of every rarity tier from a set, and OP-18's Special Card, Treasure Rare, and DON!! slots are exactly the kind of pieces that make that goal genuinely challenging rather than a simple checklist.
Budgeting singles purchases for the hardest-to-find tiers early, rather than assuming a few box openings will eventually cover them, is a more realistic way to approach that kind of full-set collecting goal.
A card's real-world scarcity depends on total print run just as much as its rarity slot count, and Bandai has not published exact print numbers for OP-18's Special Card, Treasure Rare, or DON!! tiers.
Until sales data accumulates after release, treat the rarity slot count as a directional signal of difficulty rather than a precise measure of exactly how many physical copies will exist worldwide.
One.
Six.
The resource system players use to power abilities and attacks each turn.
With only one in the set, it is comparably or more difficult to pull than either of OP-18's two Secret Rares.
Chasing OP-18's full rarity spread, including its rarest single-copy tiers, is a realistic long-term collecting goal worth planning for properly.
EVORETRO's Acrylic Case Display keeps sealed OP-18 boxes protected and presentable while you work toward completing the set's rarest tiers. Check out the EVORETRO Acrylic Case Display for Bandai One Piece OPP 4-6 TCG Booster Box.
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