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Mathematician (Quarter Century Secret Rare) Quarter Century Stampede #RA04-EN223 Yu-Gi-Oh! card
Quarter Century Secret Rare

Mathematician (Quarter Century Secret Rare) Quarter Century Stampede #RA04-EN223

Card #RA04-EN223
Market value · ungraded
$6.92
▲ 3.1% · 30d
PSA 10
$71
10× raw
Blended from live market data · graded from real sold data
Confidence medium · estimate, not an appraisal · How we price →
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Mathematician (Quarter Century Secret Rare) is a Quarter Century Secret Rare Yu-Gi-Oh! card from Quarter Century Stampede (#RA04-EN223). Its current blended market value is $6.92 ungraded, with a PSA 10 worth around $71. Prices update from real market data.

Graded prices
Ungraded (raw)$6.92
PSA graded price estimates by grade
GradeRelative valuePrice
PSA 10$71$71–$71
PSA 9$33$33–$33
“Sold” = median of real recent sold listings at that grade (eBay or Fanatics Collect — hover a badge to see which). Other figures are blended marketplace estimates. Confidence reflects source backing and price spread — not PSA-official values.

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Price history · Raw

1 Apr 202521 Aug 2026
Latest
$6.92
Period high
$8.87
Period low
$3.00
Change
▲ 15.0%
Available to buy nowLive on eBay

Card details

Set
Quarter Century Stampede
Number
#RA04-EN223
Rarity
Quarter Century Secret Rare
Game
Yu-Gi-Oh!

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All Quarter Century Stampede cards →

Where to buy & check prices

Check recent sold prices
eBay sold

Frequently asked questions

How much is Mathematician (Quarter Century Secret Rare) worth?

Mathematician (Quarter Century Secret Rare) (Quarter Century Stampede #RA04-EN223) is worth around $6.92 ungraded, or about $71 in PSA 10, based on live Yu-Gi-Oh! market data.

What is a PSA 10 Mathematician (Quarter Century Secret Rare) worth?

A PSA 10 Mathematician (Quarter Century Secret Rare) sells for around $71, roughly 10× the ungraded price.

Where can I buy Mathematician (Quarter Century Secret Rare)?

You can buy Mathematician (Quarter Century Secret Rare) on TCGplayer, Cardmarket and eBay — see the live listings on this page. Always compare against the blended market value first.

What rarity is Mathematician (Quarter Century Secret Rare)?

Mathematician (Quarter Century Secret Rare) is a Quarter Century Secret Rare Yu-Gi-Oh! card from the Quarter Century Stampede set.

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Citation
Mathematician (Quarter Century Secret Rare) (Quarter Century Stampede #RA04-EN223) — Yu-Gi-Oh! market value $6.92, PSA 10 $70.56. Source: CardTrack, https://cardtrack.com/yugioh/card/quarter-century-stampede/mathematician-quarter-century-secret-rare-ra04-en223
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<iframe src="https://cardtrack.com/embed/card?id=yugioh-quarter-century-stampede-mathematician-quarter-century-secret-rare-quarter-century-secret-rare" width="100%" height="160" style="border:0;max-width:460px" title="Mathematician (Quarter Century Secret Rare) price — CardTrack" loading="lazy"></iframe> <p style="font:12px system-ui">Source: <a href="https://cardtrack.com">CardTrack</a></p>