How much is Sea Monster of Theseus worth right now?

Sea Monster of Theseus from Raging Tempest is trading around $19.87 raw (ungraded) on the secondary market, and around $63.87 as a PSA 10. TCGIndex refreshes this price every day.

How much is Sea Monster of Theseus PSA 10 worth?

A PSA 10 Sea Monster of Theseus sells for around $63.87, a PSA 9 around $18.79, against $19.87 for a raw copy. These are market prices from verified sold listings, updated daily.

Is Sea Monster of Theseus worth grading?

A PSA 10 Sea Monster of Theseus is worth about 3.2 times the raw price ($63.87 vs $19.87). Grading pays off when the gap covers the grading fee and the risk of a 9 ($18.79): a 9 here is worth little more than a raw copy, so it pays only for a copy you expect to come back a 10.

Is Sea Monster of Theseus going up or down?

Sea Monster of Theseus is down 8.9% over 30 days, unchanged over 7 days, and the trend currently reads down. The full price history is on this page.

Is Sea Monster of Theseus a good investment?

TCGIndex doesn't give financial advice, but here's the data worth knowing: it sits around $19.87, down 8.9% over the last 30 days, with low volatility. Prices can move fast, so look at the trend and your own timeframe before you buy. TCGIndex publishes one Yu-Gi-Oh pick every morning; each pick becomes public 14 days later and is scored at day 30.

Home/Yu-Gi-Oh/Raging Tempest#RATE-EN081

Yu-Gi-Oh · Secret Rare

Sea Monster of Theseus

Name: Sea Monster of Theseus (Raging Tempest)
Brand: Yu-Gi-Oh
Availability: InStock

RATE-EN081Raging Tempest

$19.87

-$1.95-8.9% · 30D

Aggregated from verified sold data · eBay, TCGplayer & PriceCharting

Where these prices come from

Yu-Gi-Oh prices on TCGIndex are TCGplayer market prices (the US market), in US dollars, with graded and sold prices from PriceCharting and eBay. Another currency is a conversion from USD at the day's rate, not a European market price. We do not use Cardmarket or Cardtrader prices for Yu-Gi-Oh.

Market Health

Excellent

Strong demand

Confidence

74/100

Reliable

Liquidity

High

Active market

Sales Volume

143 / yr

Sold per year, updated 22h ago

BuyBuy on TCGplayer Recent eBay Sales

We may earn a commission from qualifying purchases made through our eBay & TCGplayer links.

Before the price moves

We find the Yu-Gi-Oh cards about to rise.

Every night the model scores every Yu-Gi-Oh! card on the market. Every morning at 07:30 UTC it publishes the one most likely to gain 10% within 30 days, with its entry price and the reasons, then scores it in public.

Hit +10%: 54%
Average return, day 30: +16.8%
Picks scored: 147

Last 90 days, live picks only, losses included.

Picked before they moved

+232.5%

Assault Blackwing - Kusanagi the Gathering Storm (Starlight Rare)

$11.87 → $39.47

+127.7%

Superdreadnought Rail Cannon Gustav Rocket (Starlight Rare)

See today’s Yu-Gi-Oh! pick

Published this morning, public in 14 days. Full record

Pick of the day

Today’s Yu-Gi-Oh! pickBreakoutEntry $20 to $50

A Yugioh chase rarity turned sharply off its quarter low this week while its set slipped, with an older high still sitting well overhead.

See today’s Yu-Gi-Oh! pickPublic in 14 days, when 59% of the move is gone. Full record

Price & Volume

Market price Sales volume

Jul 2026 – today

Sales & Liquidity

Market Price$19.87

7-Day Change+0.0%

90-Day Change-18.9%

LiquidityHigh

Market TrendStable

Price by Grade

BGS 10$83·

PSA 10$64·

SGC 10$38·

CGC 10$26·

PSA 9$19·

Raw· 143 sales$20·

Price by Condition · 9

Anchored to market price · condition spread from TCGplayer

Near Mint

Unlimited · English

$19.87

-6.1%

Near Mint

1st Edition · English

$5.61

-4.6%

Lightly Played

1st Edition · English

$12.79

-6.6%

Lightly Played

Unlimited · English

$19.12

-2.2%

Moderately Played

1st Edition · English

$13.08

-7.4%

Moderately Played

Unlimited · English

$19.23

+6.2%

Heavily Played

1st Edition · English

$8.80

-41.2%

Heavily Played

Unlimited · English

$15.00

+51.7%

Damaged

1st Edition · English

$14.33

+26.5%

Sea Monster of Theseus price history

Near Mint market price on the dates below, from TCGIndex's daily record (111 days tracked). High $25.90 on Jun 2026, low $2.76 on Jan 2026.

When	Price	vs today
Today	$19.87
7 days ago	$19.87	+0.0%
30 days ago	$21.82	-8.9%
90 days ago	$24.50	-18.9%
6 months ago	$19.95	-0.4%

Month	Month-end price
Jan 2026	$2.76
Feb 2026	$3.04
Mar 2026	$3.77
Apr 2026	$12.20
May 2026	$21.24
Jun 2026	$25.33
Jul 2026	$24.90
Aug 2026	$24.16
Sep 2026	$21.82
Oct 2026	$19.87

Sea Monster of Theseus PSA 10 price and graded values

What Sea Monster of Theseus (Raging Tempest) sells for by grade, from verified sold listings. A PSA 10 sells for $63.87 against $19.87 raw, a 3.2x grading premium. PSA 9 copies trade around $18.79.

Grade	Market price	vs raw
Raw (ungraded)	$19.87
PSA 9	$18.79	0.9x
CGC 10	$26.00	1.3x
SGC 10	$38.00	1.9x
PSA 10	$63.87	3.2x
BGS 10	$83.00	4.2x

Graded prices: PriceCharting sold data, refreshed daily. Grading costs, turnaround and the odds of a 10 decide whether the premium is worth chasing. Most valuable Yu-Gi-Oh PSA 10 cards

Sea Monster of Theseus FAQ

How much is Sea Monster of Theseus worth right now?: Sea Monster of Theseus from Raging Tempest is trading around $19.87 raw (ungraded) on the secondary market, and around $63.87 as a PSA 10. TCGIndex refreshes this price every day.
How much is Sea Monster of Theseus PSA 10 worth?: A PSA 10 Sea Monster of Theseus sells for around $63.87, a PSA 9 around $18.79, against $19.87 for a raw copy. These are market prices from verified sold listings, updated daily.
Is Sea Monster of Theseus worth grading?: A PSA 10 Sea Monster of Theseus is worth about 3.2 times the raw price ($63.87 vs $19.87). Grading pays off when the gap covers the grading fee and the risk of a 9 ($18.79): a 9 here is worth little more than a raw copy, so it pays only for a copy you expect to come back a 10.
Is Sea Monster of Theseus going up or down?: Sea Monster of Theseus is down 8.9% over 30 days, unchanged over 7 days, and the trend currently reads down. The full price history is on this page.
Is Sea Monster of Theseus a good investment?: TCGIndex doesn't give financial advice, but here's the data worth knowing: it sits around $19.87, down 8.9% over the last 30 days, with low volatility. Prices can move fast, so look at the trend and your own timeframe before you buy. TCGIndex publishes one Yu-Gi-Oh pick every morning; each pick becomes public 14 days later and is scored at day 30.

Other printings of Sea Monster of Theseus

Sea Monster of Theseus has 2 other priced printings, from $0.20 to $0.93. Cheapest first.

Sea Monster of Theseus

We find the Yu-Gi-Oh cards about to rise.

Sea Monster of Theseus price history

Sea Monster of Theseus PSA 10 price and graded values

Sea Monster of Theseus FAQ

Other printings of Sea Monster of Theseus

More cards from Raging Tempest