Underworld Circle [Secret Rare] #MAMO-EN021
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Underworld Circle [Secret Rare] #MAMO-EN021 collector guide
About Underworld Circle
Underworld Circle is a Continuous Spell Card, printed as MAMO-EN021 in Magnificent Monsters (2026) as a Secret Rare. Magnificent Monsters is a 2026 set, and its highest rarities include some of the most valuable modern Yu-Gi-Oh! cards we track. Ungraded, this printing ranks 163rd of the 220 Magnificent Monsters cards we track. The top card is Dark Magician, the Pharaoh's Servant at €40,161.
Character and collecting appeal
Its effect centres on banishing cards, Special Summoning and destroying cards.
Version and identification
Check the code printed below the artwork on the right: it should read MAMO-EN021. MAMO-EN021 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 Secret Rare version. Secret Rares have a rainbow-foil name and diagonal holographic artwork. Magnificent Monsters has 2 other printings of Underworld Circle: MAMO-EN021 (€0.93) and MAMO-EN021 Starlight Rare (€3.89). 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 €0.70, a PSA 9 for €6.24 and a PSA 10 for €31.80. Our monthly prices for it go back to September 2026. The current price is its high point on our records. Of the 3 printings of Underworld Circle we track, this one ranks 3rd by ungraded value. The most valuable is Magnificent Monsters MAMO-EN021 Starlight Rare at €3.89.
Grading and population
A PSA 10 sells for 45.4× the ungraded price and 5.1× 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: large modern print runs, which tend to cap prices unless a card becomes iconic. Past prices do not guarantee future ones. This is not financial advice.
Before you buy
Expect to pay around €0.70 for a clean ungraded copy; played copies sell for less, and a PSA 9 costs about €6.24. Ask the seller to show the code MAMO-EN021 and the 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 Magnificent Monsters cards
How much is Underworld Circle [Secret Rare] #MAMO-EN021 (Magnificent Monsters) worth?
As of , an ungraded copy of Underworld Circle [Secret Rare] #MAMO-EN021 from Magnificent Monsters sells for about €0.70 (about $0.79), a PSA 9 for about €6.24 (about $7.00) and a PSA 10 for about €31.80 (about $35.66). These values are based on 25 recent completed sales, the latest on 19 Oct 2026. A PSA 10 sells for 45.4× the ungraded price.
Prices are market values from completed sales, shown in euros (converted from US dollars) and updated every few hours.
Underworld Circle [Secret Rare] #MAMO-EN021 FAQ
How much is Underworld Circle [Secret Rare] #MAMO-EN021 (Magnificent Monsters) worth?
Ungraded, Underworld Circle [Secret Rare] #MAMO-EN021 (Magnificent Monsters) is worth about €0.70 (about $0.79). A PSA 9 sells for about €6.24 (about $7.00). A PSA 10 sells for about €31.80 (about $35.66). Based on recent completed sales as of 23 Oct 2026.
What is a PSA 10 Underworld Circle [Secret Rare] #MAMO-EN021 worth?
A PSA 10 Gem Mint Underworld Circle [Secret Rare] #MAMO-EN021 (Magnificent Monsters) recently sold for about €31.80 (about $35.66). Its highest monthly PSA 10 value was €31.80 in October 2026.
Is Underworld Circle [Secret Rare] #MAMO-EN021 (Magnificent Monsters) worth grading?
A PSA 10 sells for about 45.4× the ungraded price (€31.80 vs €0.70). The gap is small, so grading fees may outweigh the gain for most copies.
When was Underworld Circle [Secret Rare] #MAMO-EN021 (Magnificent Monsters) released?
Underworld Circle [Secret Rare] #MAMO-EN021 was released on September 4, 2026 as part of Magnificent Monsters.