About Theory Cards
Collectible trading cards - the most valuable, rarest and most talked-about, ranked and explained.
What we cover
- Pokémon - The biggest hobby - Charizards, vintage WOTC and modern chase cards.
- Sports Cards - Football, NBA, NFL and baseball - rookies, vintage and record sales.
- Magic: The Gathering - Power Nine, the reserved list, staples and sealed.
- Yu-Gi-Oh! & One Piece - The fast-growing TCGs and their chase cards.
- Grading - PSA, CGC and Beckett - how it works and whether it is worth it.
- Market & Investing - Price moves, auction records and what holds value.
- News - Record sales, new set releases and hobby stories.
How we work
We work from primary sources: the grading companies' own standards and population reports, auction house results, and the set checklists published by the card makers themselves. Where we learn of something from a price guide, a forum or another publication, we treat it as a lead and go back to the original before we write.
We do not republish press releases as articles, and we do not rewrite other publications' reporting. Where a claim rests on a filing, a dataset or an official announcement, we link to it.
Some of our reporting is produced with the assistance of AI tools. Every story is reviewed by a human editor before it is published. We publish under the name of the publication rather than under individual bylines.
Our approach
Theory Cards is a new title, launching in 2026. We are building a running record of the trading-card hobby: which cards are worth what and why, how grading actually works and what it costs, how print runs and editions differ, and the details that decide whether a card is worth sending away or leaving in the binder.
We write about collectible cards, not investments. Values move, sometimes sharply, and a grade is an opinion a grading company forms on the day rather than a guarantee. Anything we publish is general information and is no substitute for advice on your own circumstances.
We would rather publish fewer stories and get them right than chase every headline.
Corrections
If we have got something wrong, tell us at editor@theorycards.org.uk. We will correct it, and the article will say that it has been corrected and when. Our editorial standards set out how we handle this.
Contact
Full details, including what to send us, are on our contact page. Press officers should start there.
Publisher
Theory Cards, United Kingdom