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: Companies House filings, funding announcements from the companies and investors involved, regulator data from the FCA and British Business Bank, and the founders, investors and operators affected. Where we learn of a story from a press release or another publication, we treat it as a lead and go back to the original source 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 UK trading-card hobby: the funding rounds and valuations, the founders behind them, the moves growth-stage companies make, and how founders and investors eventually exit.
Our reporting is journalism about startups and funding, not investment advice. It is published for general information and is no substitute for advice tailored to 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