Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143
Lowest prices on eBay now
Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 collector guide
About Thestalos the Firestorm Monarch
Thestalos the Firestorm Monarch is an Effect Monster, printed as RA03-EN143 in Quarter Century Bonanza (2024) as a Quarter Century Secret Rare. It is a Level 6 FIRE Pyro monster with 2,400 ATK and 1,000 DEF. At its Level it needs one Tribute to Normal Summon. Quarter Century Bonanza, released in late 2024, mixes classic cards from the original series with modern staples, each in several rarities including Quarter Century Secret Rare and Platinum Secret Rare. Ungraded, this printing ranks 222nd of the 968 Quarter Century Bonanza cards we track. The top card is Blue-Eyes White Dragon at €192.99.
Character and collecting appeal
Pyro monsters are fire-themed and often deal direct damage. In play, it is a card for dealing damage and discarding.
Version and identification
Check the code printed below the artwork on the right: it should read RA03-EN143. RA03-EN143 is the English printing. Other languages use their own letters in place of EN, such as DE or FR, and are priced separately. It is the Quarter Century Secret Rare version. Quarter Century Secret Rares were introduced for the game's 25th anniversary. Quarter Century Bonanza has one other printing of Thestalos the Firestorm Monarch: RA03-EN143 Platinum Secret Rare (€2.78). Each has its own price, so match the code, edition and rarity exactly.
Price history
Today an ungraded copy of this printing sells for about €6.77, a PSA 9 for €33.37 and a PSA 10 for €65.72. Our monthly prices for it go back to November 2024. Over the last 12 months ungraded copies are down 15%, and up 4% in the last month. Its highest monthly ungraded value was €9.67 in September 2025, 30% above today. PSA 10 copies have moved down 15% over the same 12 months.
Grading and population
A PSA 10 sells for 9.7× the ungraded price and 2× a PSA 9. That gap is small, so grading fees may outweigh the gain unless the card is for your own collection. Modern foils can leave the pack with scratches, print lines or a slight curl, so even fresh copies do not always reach a 10.
Investment potential
In its favour: an active market (25 recent completed sales), so it is easy to sell. Against it: falling prices, down 15% in a year; large modern print runs, which tend to cap prices unless a card becomes iconic. Card prices can fall as well as rise, so this is not financial advice.
Before you buy
Expect to pay around €6.77 for a clean ungraded copy; played copies sell for less, and a PSA 9 costs about €33.37. Ask the seller to show the code RA03-EN143 and the Quarter Century Secret Rare finish clearly in the photos, as listing titles often mix up printings. Modern foils can be scratched or curled straight from the pack, so check the surface under a light if you plan to grade.
Card details and image from YGOPRODeck. Yu-Gi-Oh! is a trademark of Konami; Search Cards is not affiliated with Konami.
Most popular Quarter Century Bonanza cards
How much is Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 (Quarter Century Bonanza) worth?
As of , an ungraded copy of Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 from Quarter Century Bonanza sells for about €6.77 (about $7.59), a PSA 9 for about €33.37 (about $37.42) and a PSA 10 for about €65.72 (about $73.70). These values are based on 25 recent completed sales, the latest on 20 Oct 2026. Ungraded values are down 15% over the last 12 months and PSA 10 values are down 15%. A PSA 10 sells for 9.7× the ungraded price.
Prices are market values from completed sales, shown in euros (converted from US dollars) and updated every few hours.
Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 FAQ
How much is Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 (Quarter Century Bonanza) worth?
Ungraded, Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 (Quarter Century Bonanza) is worth about €6.77 (about $7.59). A PSA 9 sells for about €33.37 (about $37.42). A PSA 10 sells for about €65.72 (about $73.70). Based on recent completed sales as of 23 Oct 2026.
What is a PSA 10 Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 worth?
A PSA 10 Gem Mint Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 (Quarter Century Bonanza) recently sold for about €65.72 (about $73.70), down 15% over the last 12 months. Its highest monthly PSA 10 value was €89.44 in September 2025.
Is Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 (Quarter Century Bonanza) worth grading?
A PSA 10 sells for about 9.7× the ungraded price (€65.72 vs €6.77). The gap is small, so grading fees may outweigh the gain for most copies.
Is Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 (Quarter Century Bonanza) going up in value?
Ungraded Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 values are down 15% over the last 12 months and up 4% over the last month. The highest monthly ungraded value was €9.67 in September 2025.
When was Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 (Quarter Century Bonanza) released?
Thestalos the Firestorm Monarch [Quarter Century Secret Rare] #RA03-EN143 was released on November 7, 2024 as part of Quarter Century Bonanza.