Thestalos the Firestorm Monarch Ultimate Rare RDS-EN021 Unlimited price and PSA 10 value

Thestalos the Firestorm Monarch Ultimate Rare RDS-EN021 Unlimited 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 Express ($199), so your all-in cost is $254.

Grade	Sells for	PSA fee at that value	You make
PSA 10	$2,037	Express $199	+$1,518.10
PSA 9	$178	Standard $59.99	+$39.90
PSA 8	$114	Standard $59.99	−$15.89

The slab has to sell for at least $292 to break even. A PSA 10 sells for about 41 times the raw price, and a PSA 9 for about 3.6 times.

Other grades: a 9.5 sells for about $196 and a BGS 10 for about $2,648.

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 +$1,518.10 and a PSA 9 +$74.90. 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 Ultimate Rare RDS-EN021 Unlimited
• SetRise of Destiny (RDS)
• PrintingUnlimited
• RarityUltimate Rare
• ReleasedDec 03, 2004
• Set type2002 to 2005

Only about 11 tracked sales back these prices, so expect some swing between one sale and the next.

See current Thestalos the Firestorm Monarch Ultimate Rare RDS-EN021 Unlimited listings on TCGplayer

Before you grade this card

Older cards often show edge wear, whitening on the back corners and light surface scratches from play and binder storage, so high grades are rare. Check all four back corners and tilt the card under a bright light before you pay a gem-mint price. 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.