Mermaid Knight is a Level 4 WATER Aqua Effect Monster from the 2005 Yu-Gi-Oh! Structure Deck: Fury from the Deep, serving as a foundational piece for Umi archetype gameplay.
Mermaid Knight
2005 • Yu-Gi-Oh! • Structure Deck: Fury from the Deep
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Market Price Guide
| Condition | Value | Comps | Source | Price Date |
|---|---|---|---|---|
| Raw / Ungraded | $1.54 | Unknown | Guide Estimate Based on TCGplayer Market (reference) | Source Observation Date Unavailable |
Price HistoryOver the last 30 days, stored prices ranged from $1.54 to $1.54 across 2 capture days. Change between Sep 4, 2026 and Sep 10, 2026: 0%. Compares the same source, grade and signed status. Capture days are not completed-sale counts. | ||||
Raw / Ungraded
$1.54- Comps
- Unknown
- Source
Guide Estimate
Based on TCGplayer Market (reference)- Price Date
- Source Observation Date Unavailable
Price HistoryOver the last 30 days, stored prices ranged from $1.54 to $1.54 across 2 capture days. Change between Sep 4, 2026 and Sep 10, 2026: 0%. Compares the same source, grade and signed status. Capture days are not completed-sale counts.
Price History
Description
Mermaid Knight, cataloged as SD4-EN011, is a staple monster card from the 2005 Yu-Gi-Oh! Structure Deck: Fury from the Deep. Released during the early days of the trading card game's international expansion, this Structure Deck was designed to introduce players to the strategic depths of the Aqua archetype. The deck centers around the legendary Water Dragon, Umi, and this card acts as a critical support piece for that specific theme. As a Level 4 WATER Aqua Effect Monster, Mermaid Knight fits into the broader ecosystem of aquatic-based strategies that have defined various formats over the years. Its inclusion in the Structure Deck highlights the importance of early-game resource management and archetype synergy. Collectors often seek out cards from this release not just for gameplay utility, but for their historical significance in the evolution of Yu-Gi-Oh! Mechanics and deck construction. For fans of the Umi archetype, maintaining a complete copy of Mermaid Knight is essential for rebuilding classic decks or exploring legacy strategies. The card’s identity as a Common rarity from SD4 makes it accessible for new collectors while remaining a familiar sight for veterans who remember the era when Structure Decks were the primary way to acquire themed card pools. Whether you are looking to complete your Structure Deck collection or simply appreciate the foundational cards of the Aqua type, this release offers a direct connection to the game's rich history.
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Card Details
The catalog profile below summarizes the card identity, featured subject, and notable collectible traits.
Catalog Profile
The core identity of the card within the set.
Featured Subject
The subject, team, league, and sport context tied to this card.
Featured
Mermaid Knight
Game
Yu-Gi-Oh!
TCG Attributes
Rarity, print treatment, and game-specific stats for this card.
Common
Card Stock
English
Water
Aqua
4
1500 / 700
Umi
Card Text
Abilities, attacks, oracle text, and flavor text printed on the card.
While "Umi" is face-up on the field, this card can attack twice during the same Battle Phase.
