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TickerMint prices every card daily from its own TCGplayer record since 2024. No black boxes.
Mermail King - Neptabyss YU-GI-OH
Mermail King - Neptabyss #MP25-EN415 (2025 Mega-Pack) is worth about $0.22 today, the TCGplayer market price for any condition as of 2026-11-02, down 19% over 30 days; PSA 10 copies sell for about $31.56 (PriceCharting sold listings).
Graded prices
sold listings,| Grade | Sells for | vs ungraded |
|---|---|---|
| Ungraded | $0.26 | |
| Grade 8 | $5.56 | |
| Grade 9 | $6.00 | |
| Grade 9.5 | $7.00 | |
| PSA 10 | $31.56 | |
| BGS 10 | $41.00 | |
| CGC 10 | $13.00 | |
| SGC 10 | $19.00 |
Prices from PriceCharting ↗ · Ungraded is a typical raw sale in any condition; grades 7 to 9.5 are any grading company.
price trend and the high since we began tracking: more ↓less ↑
Mermail King - Neptabyss #MP25-EN415 is trending down: $0.22 today, down 19% in 30 days and 24% below its high of $0.29 (2026-10-08), the highest since we began tracking (2026-09-16), but 1.6x its low of $0.14 (2026-10-21). TCGplayer market price as of 2026-11-02, tracked daily since 2026-09-16. chart →
Price data for your app or store: free API key · daily history since 2024 · CSV download
WORTH GRADING?
Grading Mermail King - Neptabyss #MP25-EN415 does not pay even for a 10: PSA 10 copies sell for about $31.56 and grade 8 copies for $5.56 (PriceCharting sold listings, Nov 2, 2026) vs $0.22 raw (TCGplayer market), and after a $25 grading fee, $10 shipping and 13% selling fees a 10 nets nothing, less than the $0.19 a raw sale nets. run your own numbers →
WHERE TO BUY AND SELL
1st Edition · eBay scanned Sep 25show the work →
| TCGplayer market | $0.22 | verify ↗ |
| TCGplayer lowest ask | $0.01 | |
| eBay delivered floor (scanned 38d ago) | $0.99 | the listing ↗ |
GAME DATA[ + ] SHOW[ × ] HIDE
- ATTACK
- 2400
- ATTRIBUTE
- WATER
- CARD TYPE
- Link/Effect Monster
- LINKARROWS
- Bottom-Left;Bottom;Bottom-Right
- LINKRATING
- 3
- DESCRIPTION
- 2+ monsters, including a Fish, Sea Serpent, or Aqua monster Your opponent cannot target WATER monsters this card points to with card effects. You can only use each of the following effects of "Mermail King - Neptabyss" once per turn. If a WATER monster(s) is sent to the GY to activate a card or effect (except during the Damage Step): You can take 1 "Abyss-" Equip Spell from your Deck or GY and either add it to your hand or equip it to this card. If this card in its owner's possession is destroyed by an opponent's card: You can add 1 "Atlantean" or "Mermail" monster from your Deck to your hand.
- MONSTERTYPE
- Sea Serpent
MORE FROM 2025 MEGA-PACK
FULL SET →
PRICE FAQ
What is Mermail King - Neptabyss (2025 Mega-Pack) worth today?
+×
Mermail King - Neptabyss [1st Edition] has a TCGplayer market price of $0.22 as of 2026-11-02.
Is Mermail King - Neptabyss going up or down in price?
+×
Mermail King - Neptabyss #MP25-EN415 is trending down: $0.22 today, down 19% in 30 days and 24% below its high of $0.29 (2026-10-08), the highest since we began tracking (2026-09-16), but 1.6x its low of $0.14 (2026-10-21). TCGplayer market price as of 2026-11-02, tracked daily since 2026-09-16. Other windows: up 29.4% over 7 days. A 30-day drop this size is common after a reprint or a set rotation; the daily chart shows whether it has found a floor.
What is the highest price for Mermail King - Neptabyss since TickerMint began tracking?
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TickerMint began tracking Yu-Gi-Oh prices on 2026-09-16, after Mermail King - Neptabyss came out, so these are the highest and lowest prices since we began tracking (2026-09-16), not all-time records. In TickerMint's daily data (since September 2026), the TCGplayer market price for Mermail King - Neptabyss [1st Edition] (all conditions) peaked at $0.29 (2026-10-08) and bottomed at $0.14 (2026-10-21).
How much is a PSA 10 Mermail King - Neptabyss #MP25-EN415 worth?
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A PSA 10 Mermail King - Neptabyss #MP25-EN415 sells for about $31.56, based on PriceCharting's sold listings as of Nov 2, 2026. Other 10s: BGS 10 $41.00, CGC 10 $13.00, SGC 10 $19.00. A grade 9 (any grader) sells for about $6.00. An ungraded copy sells for about $0.26. Prices from PriceCharting (pricecharting.com).
Is Mermail King - Neptabyss #MP25-EN415 worth grading?
+×
Grading Mermail King - Neptabyss #MP25-EN415 does not pay even for a 10: PSA 10 copies sell for about $31.56 and grade 8 copies for $5.56 (PriceCharting sold listings, Nov 2, 2026) vs $0.22 raw (TCGplayer market), and after a $25 grading fee, $10 shipping and 13% selling fees a 10 nets nothing, less than the $0.19 a raw sale nets. That assumes a copy that misses the 10 sells as a grade 8. Whether your copy grades a 10 depends on its centering, corners, edges and surface. Prices from PriceCharting (pricecharting.com).
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