Mermaid Knight
Effect Monster
Mermaid Knight is a Effect Monster (WATER/Aqua, Level 4) with 1500 ATK / 700 DEF. First printed in Ancient Sanctuary (2004).
- Type
- Effect Monster
- Attribute
- WATER
- Monster type
- Aqua
- Level
- 4
- ATK / DEF
- 1500 / 700
- Archetype
- Umi
- Banlist
- Unlimited in the TCG, OCG, and Master Duel
- TCG release
- Jun 1, 2004
- Printings
- 3
Card text
As long as "Umi" remains face-up on the field, this card can attack twice during the same Battle Phase.
YGOPRODeck card-level price
≈$0.39 lowest USD figure across marketplaces, for no one printing
YGOPRODeck recorded a lowest available USD card-level price hint of ~$0.39 on Oct 26, 2026 (historical, not a printing-specific quote). It varies with printing, condition, edition, rarity, and grading. Check current listings before buying or selling.
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Printings & rarities
| Set | Set code | Rarity | Release | Price* | Buy |
|---|---|---|---|---|---|
| Ancient SanctuaryAST-025 · Common · Jun 1, 2004 | AST-025 | Common | Jun 1, 2004 | ~$1.37 1st Edition~$0.67 Unlimited | Buy on TCGplayerSearch eBay |
| Structure Deck: Fury from the DeepSD4-EN011 · Common · May 9, 2005 | SD4-EN011 | Common | May 9, 2005 | ~$0.491st Edition | Buy on TCGplayerSearch eBay |
| Dark Revelation Volume 2DR2-EN137 · Rare · Oct 20, 2005 | DR2-EN137 | Rare | Oct 20, 2005 | ~$9.21Unlimited | Buy on TCGplayerSearch eBay |
*Approximate price hints, not appraisals. A price with a finish (1st Edition, Unlimited, Limited) is TCGplayer's for that set code, rarity and finish, via TCGCSV, updated Oct 26, 2026. A price marked YGOPRODeck is YGOPRODeck's figure for that printing. A dash means that printing has no price yet. Buy links are affiliate links.
Price hint history
Dated YGOPRODeck snapshots. These hints are not sales or market values.
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Mermaid Knight in other languages
| Japanese | マーメイド・ナイト |
| Korean | 인어 나이트 |
| German | Meerjungfrau-Ritter |
| French | Chevalier Sirène |
| Italian | Sirena Cavaliere |
| Spanish | Caballero Sirena |
| Portuguese | Cavaleira Sereia |
