Collectible trading-card news and guides: the most valuable Pokemon, sports, Magic and TCG cards, grading, and where the market is moving.https://www.theorycards.org.uk/en-gbWed, 02 Sep 2026 09:00:00 GMTeditor@theorycards.org.uk (Theory Cards)editor@theorycards.org.uk (Theory Cards)Copyright 2026 Theory Cards60https://www.theorycards.org.uk/images/theorycards-logo.pnghttps://www.theorycards.org.uk/https://www.theorycards.org.uk/most-expensive-pokemon-cards-ever-sold/https://www.theorycards.org.uk/most-expensive-pokemon-cards-ever-sold/A $16.49m Pikachu now sits at the top of the entire hobby. Inside the record that rewrote the card market.Wed, 02 Sep 2026 09:00:00 GMTTheory CardsPokémonhttps://www.theorycards.org.uk/most-expensive-sports-cards-ever-sold/https://www.theorycards.org.uk/most-expensive-sports-cards-ever-sold/A $12.6m Mantle, the legendary T206 Wagner and a $5.2m LeBron - the record sales that define sports collecting.Tue, 01 Sep 2026 09:00:00 GMTTheory CardsSports Cardshttps://www.theorycards.org.uk/most-expensive-magic-the-gathering-cards/https://www.theorycards.org.uk/most-expensive-magic-the-gathering-cards/A $3m Alpha Black Lotus and a one-of-one The One Ring - and the Reserved List that keeps Magic's grails scarce.Sun, 30 Aug 2026 09:00:00 GMTTheory CardsMagic: The Gatheringhttps://www.theorycards.org.uk/the-grails-cards-that-define-each-hobby/https://www.theorycards.org.uk/the-grails-cards-that-define-each-hobby/Every collecting world has one card at its summit. Here are the documented grails - and what unites them.Sat, 29 Aug 2026 09:00:00 GMTTheory CardsYu-Gi-Oh! & One Piecehttps://www.theorycards.org.uk/psa-bgs-cgc-which-grading-company/https://www.theorycards.org.uk/psa-bgs-cgc-which-grading-company/The three major graders, how their scales differ, and how to choose the right slab for your card.Thu, 27 Aug 2026 09:00:00 GMTTheory CardsGradinghttps://www.theorycards.org.uk/how-card-grading-works-worth-it/https://www.theorycards.org.uk/how-card-grading-works-worth-it/What actually happens when you send a card to be graded, and how to decide whether the slab will pay for itself.Wed, 26 Aug 2026 09:00:00 GMTTheory CardsGradinghttps://www.theorycards.org.uk/how-to-spot-a-fake-pokemon-card/https://www.theorycards.org.uk/how-to-spot-a-fake-pokemon-card/Counterfeits have never been more convincing. The tells that separate a genuine card from a fake - before you pay.Mon, 24 Aug 2026 09:00:00 GMTTheory CardsPokémonhttps://www.theorycards.org.uk/what-makes-a-pokemon-card-valuable/https://www.theorycards.org.uk/what-makes-a-pokemon-card-valuable/Rarity, grade, print run and hype - the real levers behind a card's price, explained.Sat, 22 Aug 2026 09:00:00 GMTTheory CardsPokémonhttps://www.theorycards.org.uk/rookie-cards-explained/https://www.theorycards.org.uk/rookie-cards-explained/Why a player's rookie card is almost always the one collectors chase - and how to identify a true RC.Thu, 20 Aug 2026 09:00:00 GMTTheory CardsSports Cardshttps://www.theorycards.org.uk/mtg-reserved-list-explained/https://www.theorycards.org.uk/mtg-reserved-list-explained/One policy underpins Magic's most valuable cards. Here is what the Reserved List is, and why it matters.Tue, 18 Aug 2026 09:00:00 GMTTheory CardsMagic: The Gatheringhttps://www.theorycards.org.uk/trading-card-market-boom-where-next/https://www.theorycards.org.uk/trading-card-market-boom-where-next/Record sales, new money and a maturing hobby. What the headline numbers really tell us.Sat, 15 Aug 2026 09:00:00 GMTTheory CardsMarket & Investinghttps://www.theorycards.org.uk/welcome-to-theory-cards/https://www.theorycards.org.uk/welcome-to-theory-cards/A new home for the collectible-card hobby - the grails, the market and the know-how, all in one place.Wed, 12 Aug 2026 09:00:00 GMTTheory CardsNews