How to Read a One Piece Card Effect

By CardSpicy Founder · October 4, 2026

Quick answer

Once you can read a One Piece card, you can read all of them, because every effect is written in the same grammar: square brackets for when an effect happens, curly braces for the traits it cares about, and plain text for what it does. The most common keyword in the game is [On Play], on 934 of the 2,785 cards. CardSpicy prints the effect text in full on every card in its index, unchanged from the official database.

The brackets are the whole language. Learn nine of them and you can read a card you have never seen before in about four seconds.

A One Piece effect is not written like prose. It is written like a rule, and the punctuation carries the meaning: brackets mark timing, braces mark traits, and words like “up to”, “then” and “if” decide the order. Because the grammar is fixed, the vocabulary is small. This page is that vocabulary, with the count of how often each one actually appears in the database.

The parts of a card, in reading order

Every One Piece card carries the same fields, and they answer different questions:

• The code — which product it came from and where in it. This is the card’s identity.
• The type line — whether the card is a Leader, Character, Event or Stage, followed by its trait, such as Straw Hat Crew.
• Cost — how much of your DON!! you pay to play it. Character cards run from 1 to 10, and 4 is the most common cost in the game.
• Power and counter — what it brings to a fight, and what it adds when you use it to defend. Counter values are 1,000 or 2,000 and nothing else.
• The effect box — the rules text, which is what this page is about.

On a Leader the cost field becomes something else: a Leader has a Life total instead of a cost, which is the number of face-down cards you defend. Leaders run from 2 to 6 Life, and 136 of the 142 sit at 5 or 4.

Timing keywords: when the effect happens

These are the brackets that decide the moment a card does its thing. The count is how many of the 2,785 cards carry that keyword anywhere in their effect text.

[On Play] and [When Attacking] are the two most ordinary: the first triggers as the card enters, the second as it attacks. [Activate: Main] is the one you choose to use, during your own turn. [Counter] and [Trigger] are the defensive pair, and they are worth separating: [Counter] is what you get by spending the card from your hand to defend, while [Trigger] is what happens instead if the card turns over during a Life check. [Trigger] is rare — 30 cards — which is exactly why players remember it.

Attribute keywords: what the card does

These arrive without a timing, because they are always on:

[Blocker] is the most common keyword in the game after the timings, on 374 cards: it lets the card take a hit meant for something else. [Rush] is the opposite of waiting. [Double Attack] and [Banish] are the two that change what an attack costs your opponent, and both are uncommon enough to be worth reading slowly when you meet one.

Cost gates and traits

Two more notations appear inside effects rather than beside the card type. [DON!! x1] and [DON!! x2] are conditions: the effect only turns on while that much DON!! is attached to the card. [Once Per Turn] is a limiter rather than a keyword — it means what it says, and it appears on 308 cards.

Then there are the curly braces. {Straw Hat Crew} in an effect means “a card with that trait”, and it is set in braces precisely so you cannot confuse the trait with the card’s own name. 717 cards reference a trait this way, and the trait referred to most often is {Straw Hat Crew}, followed by {Navy} and {Dressrosa}. There are 61 distinct traits referenced across the game.

Frequently asked questions

What does [On Play] mean on a One Piece card?

It is a timing keyword: the effect happens when the card is played onto the board. It is the most common keyword in the game, appearing on 934 of the 2,785 cards.

What is the difference between [Counter] and [Trigger] on a One Piece card?

[Counter] is the effect you get by spending the card from your hand to defend. [Trigger] is the effect that happens instead when the card is turned over during a Life check. There are 200 cards with [Counter] and only 30 with [Trigger].

What do the curly braces mean on an One Piece card?

They mark a trait. {Straw Hat Crew} in an effect means a card that has that trait, rather than a card with that name. 717 cards reference a trait this way.

What does [DON!! x1] mean on a One Piece card?

It is a condition on the effect: it only applies while at least that many DON!! cards are attached to the card. [DON!! x1] appears on 177 cards and [DON!! x2] on 43.

Sources

Card statistics on this page are counted from Bandai’s own card database at the date shown, so they move as the database is updated. Prices are not quoted here: this site prices graded cards in US dollars from observed sales, and a raw-card figure would be a different number measured a different way. Where a card is described as part of a set, the set code and release date are the English edition.

Related reading

• How to Read a One Piece Card Number
• The Six Colours of DON!!
• One Piece Leaders Explained
• One Piece Card Rarities Explained

Where to go next

• The CardSpicy card index — every card we track, with its PSA 10 population and market history (195 cards).
• The illustrator index — every artist behind those cards, card by card (110 artists).