WATER
4Electric Jellyfish
Archetype:
Umi
ATK:
1400
DEF:
1700
View:
4564
You can send 1 "Umi" from your hand, Deck, or face-up field to the GY; Special Summon 1 WATER monster from your hand. When your opponent activates a monster effect, or Spell Card or effect, while "Umi" is on the field (Quick Effect): You can negate that effect, then, you can make this card gain 600 ATK/DEF. You can only use each effect of "Electric Jellyfish" once per turn.
Electric Jellyfish — Power Evaluation
Final Score: 60 ± 6 · Confidence: Medium
- Intrinsic: 59 · Deck: 60 · Meta: provisional
- Primary role: Starter / Combo enabler · Secondary: Negation/Interaction
Why it scores here
Electric Jellyfish is a Level 4 WATER body whose first effect converts a Umi from hand, Deck or field into a WATER Special Summon from hand, so it is a conditional starter inside the Umi shell rather than a free-standing engine. Its quick-effect negation of monster, Spell or effect activations is real interaction, but it only works while a Umi is face-up on the field, so the score reflects that gate. High deck counts (332 of 400 decks run 3 copies) and strong partner co-occurrence confirm the card is reliably played in its home, but they do not raise its intrinsic power; with no recorded combo boards, conversion strength is inferred from text only. ATK/DEF of 1400/1700 earned nothing.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 68 | Runs 3 copies in 332 of 400 decks, and the hand-to-Special-Summon route needs a Umi plus another WATER monster, both common in its home archetype (observed, plus inferred route check). |
| Combo & Conversion | 50 | No combo boards are recorded, so conversion is text-only: a body and a repeatable negation, not a demonstrated one-card-to-board line (inferred). |
| Resource Economy | 45 | Effect 1 trades one Umi for one WATER monster, which is roughly card-neutral, and no refuel or card-advantage pattern is shown (verified text, inferred value). |
| Effect & Interaction | 60 | Quick-effect negation of monster, Spell or effect activations, once per effect per turn, but only while a Umi is on the field; no trap negation is stated (verified). |
| Material Utility | 60 | A Level 4 WATER Aqua body that stays a valid material after its effects are negated, and the Xyz partner Number 4: Stealth Kragen appears in 59% of decks (verified text, observed partner). |
| Resilience & Flexibility | 55 | Works from hand and field and has an ATK/DEF boost on negation, but depends on Umi staying on the field and each effect is once per turn (verified text, inferred). |
| Deck-Building Efficiency | 60 | Three copies run cleanly with no garnet, but the Umi-presence requirement restricts when its interaction is live (observed deck counts, verified text). |
Calculation
Weight profile: 0.7 Starter/Combo enabler + 0.3 Removal/Negation. Intrinsic ≈ 59, Deck ≈ 60, Meta = provisional. Modifiers: Umi-gated negation (-2). Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Level 4 WATER body that converts into the Umi shell in hand or Deck
- Quick-effect negation of monster, Spell or effect activations
- Stays a usable Level 4 WATER material after its effects are negated
- Run at 3 copies in 332 of 400 sampled decks with no garnet cost
Weaknesses
- Interaction is dead without a face-up Umi
- Each effect is once per turn
- Effect 1 is card-neutral, not card advantage
- No recorded combo boards to confirm one-card-to-board conversion
Counters / choke points
- Opponent monster or Spell effects that remove the Umi from the field before the negation is needed
- Interaction that targets the Umi, which cuts the negation gate
Best use
Starter / Combo enabler with Umi-gated negation. Decks: Umi, Umi Control, Shark. Suggested copies: 3.
Evidence & gaps
- Verified: Effect text: Umi send to GY and WATER Special Summon from hand; Umi-gated quick-effect negation with +600 ATK/DEF; each effect once per turn; 332 of 400 decks run 3 copies (avg 2.74); Level 4 WATER Aqua, 1400/1700
- Observed: Umi archetype in 43% of decks; gameplay type 7 in 79.5%; Kairyu-Shin co-appears in 98.2% of decks and Stealth Kragen in 59.2%; Guide 347 names Umi Control as a home for the card
- Inferred: Starter route is reachable from hand when a Umi and another WATER are present; Effect 1 is roughly card-neutral and not card advantage; Negation value depends on Umi staying face-up
- Data gaps: no combos supplied; combo conversion is text-only inference no banlist token; assumed 3 copies (unlimited) no usage statistics (StatisticsCard); inclusion % inferred from the 400-deck sample only no trap-negation wording check beyond the text quoted