Skip to main content
Reference artwork · details may differ from this copy
About This Card

The 2004 Ancient Sanctuary release features Mermaid Knight (AST-025), a Level 4 WATER Aqua Effect Monster essential for collectors of early Yu-Gi-Oh! strategy.

Mermaid Knight

2004 • Yu-Gi-Oh! • Ancient Sanctuary

No Listings Available

No listings available right now.

Market Value
Raw/Ungraded Market: $1.27
Updated 6 days ago
Based on TCGplayer Market (reference)Check Price Guide

Market & Price History

  • $1.27
    Source
    Guide Estimate
    Trend
    0%
    Price Details

30-day Price History

Raw / Ungraded

TCGplayer Market (reference) · Guide Estimate evidence · captured Nov 10, 2026

Each point is the last stored observation that day for this printing, condition, grader, autograph status and source. Gaps mean no observation; guide estimates and asking prices are not completed sales.
Product Overview

Description

Mermaid Knight (AST-025) stands as a foundational component within the Ancient Sanctuary set, released in 2004. As a Common rarity card, it serves as an accessible entry point for players and collectors exploring the early mechanical landscape of the Yu-Gi-Oh! Trading Card Game. This card is classified as an Effect Monster with the Aqua type, belonging to the WATER attribute and holding a Level 4 designation. It is intrinsically linked to the Umi archetype, providing strategic utility for decks focused on aquatic-based monster support. For collectors, AST-025 represents a tangible piece of Yu-Gi-Oh! History from the franchise's second major set expansion. The Ancient Sanctuary era introduced numerous mechanics that would define the game's competitive environment for years. Collecting this card allows enthusiasts to complete the base set, ensuring a comprehensive inventory of the era's design and gameplay evolution. Whether you are building a vintage collection, seeking specific archetype support for casual play, or simply appreciating the artistic and mechanical milestones of 2004, Mermaid Knight offers significant collector value. The platform supports collectors in their quest to complete sets or acquire specific monster cards that hold nostalgic or strategic importance. By focusing on the identity and context of each card, we help you understand the role Mermaid Knight played in the broader narrative of the game. This card is not just a game piece; it is a symbol of the early days of competitive trading card gaming, where every Aqua monster contributed to the developing meta. Whether you are a long-time veteran looking to fill a gap in your Ancient Sanctuary binder or a new collector diving into the lore of the Umi archetype, this card provides a concrete connection to the game's rich history. Understanding the attributes and types of these early monsters helps contextualize the strategic depth that has grown over the decades. Mermaid Knight remains a recognizable figure for those who follow the development of Aqua-type strategies from their earliest implementations.

Seller Action
Have one of these to sell?

We'll pre-fill the product details from this catalog entry, so your listing lands on this exact page. Just add photos of your copy, pick its condition, and set your price.

Product Specs

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.

Year

2004

Series

Ancient Sanctuary

Card Number

#AST-025

Featured Subject

The subject, team, league, and sport context tied to this card.

Game

Yu-Gi-Oh!

TCG Attributes

Rarity, print treatment, and game-specific stats for this card.

Rarity

Common

Material

Card Stock

Language

English

Attribute

Water

Monster type

Aqua

Level

4

ATK / DEF

1500 / 700

Archetype

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.

Yu-Gi-Oh! and related names, images, and marks are trademarks or copyrights of Konami, Studio Dice, Shueisha, and associated rights holders. SuperCatch is an independent marketplace and is not affiliated with, endorsed by, or sponsored by them. Full attribution.

Cards Named Mermaid Knight

Explore cards with this name across sets and editions. Check each card’s details before choosing a version.


View All Mermaid Knight Cards

Tap an image to preview it, or a card’s name to open its page.