Ruler of the End of the World #MAMO-EN121

Ruler of the End of the World #MAMO-EN121 collector guide

About Ruler of the End of the World

Ruler of the End of the World is a Ritual Monster, summoned with its Ritual Spell and Tributes, printed as MAMO-EN121 in Magnificent Monsters (2026). It is a Level 10 DARK Fiend monster with 3,000 ATK and 2,900 DEF. Its ATK is the 4th highest of the 87 monsters in the set. 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 90th 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

Fiends are one of the largest Types in the game, home to many of its darker and more unusual designs. In play, it is a card for clearing the field, banishing cards and changing ATK and DEF. Its once-per-turn limits are typical of modern card design.

Version and identification

Check the code printed below the artwork on the right: it should read MAMO-EN121. MAMO-EN121 is the English printing. Other languages use their own letters in place of EN, such as DE or FR, and are priced separately. Magnificent Monsters has one other printing of Ruler of the End of the World: MAMO-EN121 Starlight Rare (€13.81). 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 €1.77, a PSA 9 for €10.73 and a PSA 10 for €41.83. Our monthly prices for it go back to September 2026. Its highest monthly ungraded value was €2.22 in September 2026, 20% above today.

Grading and population

A PSA 10 sells for 23.6× the ungraded price and 3.9× a PSA 9. That gap is small, so grading fees may outweigh the gain unless the card is for your own collection. Even pack-fresh modern cards can have surface scratches or curling foil, so a 10 is never guaranteed.

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. Card prices can fall as well as rise, so this is not financial advice.

Before you buy

Expect to pay around €1.77 for a clean ungraded copy; played copies sell for less, and a PSA 9 costs about €10.73. Ask the seller to show the code MAMO-EN121 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.