Spell
FieldA Legendary Ocean
Archetype:
Umi
View:
5966
(This card's name is always treated as "Umi".) All WATER monsters on the field gain 200 ATK/DEF. Reduce the Level of all WATER monsters in both players' hands and on the field by 1.
A Legendary Ocean — Power Evaluation
Final Score: 45 ± 8 · Confidence: Medium
- Intrinsic: 42 · Deck: 47 · Meta: provisional
- Primary role: Utility · Secondary: Combo enabler
Why it scores here
A Legendary Ocean is a WATER-only Field Spell: it gives every WATER monster on the field +200 ATK/DEF and lowers the Level of WATER monsters in both hands and on the field by 1. It is in 400 of 400 sampled decks, usually at 3 copies, so it is a real, consistently run piece of the Umi ecosystem. It earns its score from accessibility and deck fit, not from its ATK/DEF boost. It has no recorded combos and no card advantage, so it converts into little value on its own, and the narrow WATER restriction caps its score.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 62 | In 400 of 400 sampled decks at a 2.76 average copy count, so it is reliably in hand, but no searcher route is in the evidence (observed). |
| Combo & Conversion | 35 | No recorded combos; the field boost and Level reduction add value only with WATER monsters already on board (inferred from text). |
| Resource Economy | 20 | Neither draws nor refuels nor banishes, so there is no card advantage (verified from text). |
| Effect & Interaction | 30 | The hand-wide Level reduction also hits the opponent's WATER monsters, which is mild disruption, not a negation or removal (verified from text). |
| Material Utility | 15 | It is not a monster and provides no material body; its Level reduction only shifts Level fit for WATER monsters (inferred from text). |
| Resilience & Flexibility | 35 | A Field Spell sits in one zone and dies to Field-zone removal, though 42 distinct archetypes indicate some homes beyond Umi (inferred). |
| Deck-Building Efficiency | 50 | Three copies in a WATER deck is a normal slot cost with no garnet or lock, but it is dead outside WATER builds (observed, inferred). |
Calculation
Weight profile: 0.7 Utility + 0.3 Starter/Combo enabler. Intrinsic ≈ 42, Deck ≈ 47, Meta = provisional. Modifiers: none. Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Appears in all 400 sampled decks, so it is a dependable, consistently run piece of Umi
- Clean text: a flat +200 ATK/DEF and a Level reduction, with no once-per-turn clause or cost
- Helps WATER Level matching in both hands and on the field
Weaknesses
- Only useful with WATER monsters, which limits it to WATER decks
- No card advantage, searches, or recorded combos
- Field Spell zone is easy to remove
Counters / choke points
- Field Spell removal or Field-zone destruction (inferred from card type)
- Opponent's non-WATER decks, which get no benefit from it (inferred)
Best use
Field support for WATER decks. Decks: Umi, Umi Control, Shark, Icejade. Suggested copies: 3.
Evidence & gaps
- Verified: Field Spell: all WATER monsters on the field gain 200 ATK/DEF; Reduces the Level of all WATER monsters in both players' hands and on the field by 1; Card name is always treated as Umi
- Observed: In 400 of 400 sampled decks, 2.76 copies average (325 decks at 3); Umi archetype in 44.2% of decks; 42 distinct archetypes; Top partner Kairyu-Shin in 95.8% of decks; Zero recorded combo boards
- Inferred: Level reduction helps WATER Synchro and Xyz Level matching; Dead in non-WATER decks; Vulnerable to Field-zone removal
- Data gaps: no combos supplied — combo conversion is text-only inference no banlist token — assumed 3 copies (unlimited) legal copies is empty — per-format limits unverified no usage statistics (StatisticsCard) — archetype inclusion % inferred from deck sample only no searcher or accessibility routes in evidence