Thestalos the Firestorm Monarch Quarter Century Secret Rare RA03-EN143 price and PSA 10 value

Thestalos the Firestorm Monarch Quarter Century Secret Rare RA03-EN143 grading math

Here is what you keep at each grade if you buy the card raw at today's price, pay PSA and $5 shipping, and sell the slab with a 13% selling fee. PSA's fee depends on what the card is worth after grading: it bills you up to the right tier if the card comes back worth more (the upcharge). PSA's cheapest open tier is Standard ($59.99). If this card grades a 10 it lands in Standard ($59.99), so your all-in cost is $71.91.

Grade	Sells for	PSA fee at that value	You make
PSA 10	$73.17	Standard $59.99	−$8.25
PSA 9	$36.68	Standard $59.99	−$40.00
PSA 8	$21.46	Standard $59.99	−$53.24

The slab has to sell for at least $82.66 to break even. A PSA 10 sells for about 11 times the raw price, and a PSA 9 for about 5.3 times.

Other grades: a 9.5 sells for about $40.00 and a BGS 10 for about $95.00.

PSA's cheaper Value tiers are paused right now. If they reopen (from $24.99 a card), a PSA 10 of this card would make +$26.75 and a PSA 9 −$5.00. PSA tiers checked September 20, 2026. See PSA grading cost and tiers and the full list of Yu-Gi-Oh cards worth grading.

Card details

• CardThestalos the Firestorm Monarch Quarter Century Secret Rare RA03-EN143
• SetQuarter Century Bonanza (RA03)
• Printing1st Edition
• RarityQuarter Century Secret Rare
• ReleasedNov 08, 2024
• Set type2021 and later

Only about 40 tracked sales back these prices, so expect some swing between one sale and the next.

See current Thestalos the Firestorm Monarch Quarter Century Secret Rare RA03-EN143 listings on TCGplayer

Before you grade this card

These cards usually come out of the pack clean, so centering and print lines decide most grades. Check the borders left to right and top to bottom, and tilt the card under light to spot print lines and surface scratches on the foil. Graders score centering, corners, edges and surface, and the lowest of the four usually sets the grade. Our guide to card grading shows what to look for and compares PSA, BGS and CGC.