Yu-Gi-Oh! · Ancient Sanctuary
Mermaid Knight
French name: Chevalier Sirène
Mermaid Knight (Ancient Sanctuary AST-025) has a market price of US$0.67 to US$1.32 as of Nov 9, 2026.
Price guide
The market price on TCGplayer, in US dollars: a guide, not an offer.
Market price
As of Nov 9, 2026 · The market price is TCGplayer’s, in US dollars. It is a guide, not an offer.
Card details
- Type
- Effect Monster
- Level
- 4
- Attribute
- WATER
- Monster type
- Aqua
- Archetype
- Umi
- ATK
- 1,500
- DEF
- 700
Card text
As long as Umi remains face-up on the field, this card can attack twice during the same Battle Phase.
About this card
Mermaid Knight is card AST-025 in Ancient Sanctuary, a Yu-Gi-Oh! set released Jun 1, 2004. Rarity: Common. Finishes: Unlimited, 1st Edition. Reference market price on Nov 9, 2026: US$0.67 (Unlimited), US$1.32 (1st Edition). Over the last 30 days, the Unlimited price went up 8.1%. Source: TCGplayer market data via tcgcsv.com, updated daily. A reference price is not an offer.
