Yu-Gi-Oh! · 2017 Mega-Tin Mega PackSecret Rare
Sea Monster of Theseus MP17-EN231
Sea Monster of Theseus from 2017 Mega-Tin Mega Pack (Yu-Gi-Oh!). Daily Cardmarket market price.
NumberMP17-EN231
RaritySecret Rare
LanguageEnglish
ReleasedAug 24, 2017
Illustrator—
Market price · Normal
€0.02
▼ -99.7% vs 30-day avg
Lowest€0.75
7-day avg€2.42
30-day avg€7.75
E-mail me when the price drops to
€
Price source: Cardmarket public price guide · updated Nov 3, 2026
Prices by variant
| Variant | Trend | Lowest | 30-day avg |
|---|---|---|---|
| Normal | €0.02 | €0.75 | €7.75 |
| Foil | €0.65 | — | €0.61 |
Price history
Days before Oct 30, 2026 are estimated from Cardmarket averages (30, 7 and 1 day); from then on — our daily readings.
Card details
- Name
- Sea Monster of Theseus
- ID
- cm:300883
Card value FAQ
How much is Sea Monster of Theseus MP17-EN231 worth?
Sea Monster of Theseus MP17-EN231 from 2017 Mega-Tin Mega Pack is currently worth €0.02 (Cardmarket trend, Normal variant, Nov 3, 2026). Listings start at €0.75. 30-day average: €7.75.
Which version of Sea Monster of Theseus is the most valuable?
Of its 2 variants, Foil is valued highest at €0.65.
Is Sea Monster of Theseus MP17-EN231 going up in value?
Compared with the 30-day average, the price is down 99.7%. The chart above shows the daily price history, and you can set a price-drop alert.
