WATER
4Mermaid Knight
Archetype:
Umi
ATK:
1500
DEF:
700
View:
3146
While "Umi" is face-up on the field, this card can attack twice during the same Battle Phase.
53± 5/ 100
Power Score
Intrinsic
53
Deck
53
Mermaid Knight — Power Evaluation
Final Score: 53 ± 5 · Confidence: Medium
- Intrinsic: 53 · Deck: 53 · Meta: provisional
- Primary role: Material body · Secondary: Utility
Why it scores here
Mermaid Knight is a Level 4 Aqua body that provides conditional double-attack offense when Umi is present on the field. While the card demonstrates solid material utility for Aqua-based strategies and appears consistently across 6 distinct archetypes, the 1500 ATK / 700 DEF body is relatively weak and the offense is easily shut down if Umi is removed. With zero recorded combo appearances and no guide mentions, the practical impact of the double-attack effect cannot be verified; the card scores as a dependable but modest enabler rather than a powerful engine piece.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 60 | While a Level 4 Aqua that appears in 8 recent decks, Mermaid Knight lacks direct search and relies on Umi tutors like A Legendary Ocean (87.5% co-deck rate) for consistent access (observed). |
| Combo & Conversion | 35 | The card's effect is a conditional single-card double-attack, which is purely offensive beatdown rather than combo-generative; zero recorded combo appearances support text-only inference only (inferred). |
| Resource Economy | 40 | Mermaid Knight generates no card advantage, search, or recursion on its own, functioning as a simple body whose value depends on Umi field presence (verified). |
| Effect & Interaction | 10 | The card provides zero disruption, removal, or negation; its only effect is conditional offense when Umi is present (verified). |
| Material Utility | 65 | Level 4 Aqua is a standard Synchro and Xyz material fit for Water-based strategies, though 1500 ATK / 700 DEF are generic stats without special locks, and the card can be used as material even if Umi is absent (inferred). |
| Resilience & Flexibility | 45 | The conditional effect is easily negated by Umi removal or field wipe; weak defensive stats offer poor survival; however, the card retains utility as material regardless of Umi presence (inferred). |
| Deck-Building Efficiency | 60 | Appears in manageable quantities (average 1.5 copies per deck, max 3), no apparent garnet risk, and splashes into at least 6 distinct archetypes beyond Umi core (observed). |
Calculation
Weight profile: 0.7 Material body + 0.3 Utility. Intrinsic ≈ 53, Deck ≈ 53, Meta = provisional. Modifiers: none. Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Generic Level 4 Aqua body suitable for Synchro and Xyz summons
- Consistent inclusion across 6 distinct archetypes suggests versatile splashability
- Conditional double-attack provides offensive pressure when field support (Umi) is available
- Appears in strong-partner decks with A Legendary Ocean and Levia-Dragon - Daedalus
Weaknesses
- Weak base stats: 1500 ATK / 700 DEF below expected for Level 4 material
- Conditional effect completely nullified if Umi is removed from field
- No search, recursion, or card advantage generation
- Zero recorded combo appearances — practical synergy unverified
- Requires external field spell setup to function; not self-sufficient
Counters / choke points
- Field wipe effects (Mystical Space Typhoon, Heavy Storm, etc.) remove Umi and nullify the double-attack effect
- Removal or negation targeting Mermaid Knight itself before attack declaration
- Hand traps that prevent Umi setup or early disruption of Umi field spell
Best use
Flexible Aqua body providing conditional offensive backup when field support permits. Decks: Umi, Fish, Aqua-focused control strategies. Suggested copies: 1.
Evidence & gaps
- Verified: Card name: Mermaid Knight; passcode: 24435369; Level 4 Aqua, 1500 ATK / 700 DEF; Card effect: While Umi is face-up on field, this card can attack twice during same Battle Phase; Archetype: Umi; Legal in TCG, OCG, MasterDuel, DuelLinks; Appears in 8 total decks (Sept 2023 to Aug 2026); Most frequent co-deck partner: A Legendary Ocean at 87.5%; Levia-Dragon - Daedalus at 87.5%
- Observed: Appears across 6 distinct archetypes in deck sample (Umi, Fish, and 4 others); Average 1.5 copies per deck; distribution: 5 decks at 1 copy, 2 at 2 copies, 1 at 3 copies; Consistent deck inclusion despite small sample size (8 decks) suggests accessible, flexible role
- Inferred: Material utility as Level 4 Aqua for Synchro, Xyz, and Link strategies, especially in Water-based decks; Conditional double-attack requires continuous Umi presence and is easily shut down by field removal; Moderate accessibility through Umi tutors (A Legendary Ocean) rather than direct search; Generic stats (1500 ATK / 700 DEF) limit defensive survival and offer no special material locks
- Data gaps: No combos supplied — combo conversion scored entirely from text-only inference; practical board impact unverified No guides supplied — human strategy context absent No banlist token — legal copies assumed unlimited (3 copies assumed playable) No usage statistics (StatisticsCard) — archetype inclusion % inferred from small deck sample (n=8) only No top-card ranking — competitive viability unconfirmed