Water Hazard

Water Hazard — Power Evaluation

Final Score: 51 ± 6 · Confidence: Medium

• Intrinsic: 51.8 · Deck: 53.9 · Meta: provisional
• Primary role: Starter · Secondary: Combo enabler, Extender

Why it scores here

Water Hazard is a one-card board builder in WATER decks: once per turn it turns any Level 4 or lower WATER monster in hand into a free Special Summon, which can be layered on top of a Normal Summon for Synchro or Xyz material. It reliably converts a drawn copy plus a WATER body into extra board presence in Ghoti (49.2% of the 63 sampled decks) and Deep Sea builds, but the 'control no monsters' clause locks it out the moment you already have a field, and it has no interaction of its own. Its high value comes entirely from that conversion, not from any stat line — it is a Spell with 0 ATK/DEF and was never scored on stats, rarity, or its 3420 page views. Because no combo data exists, the conversion score is text-based inference and the overall score stays mid-band.

Axis scores

Calculation

Weight profile: 0.7 Starter + 0.3 Extender. Intrinsic ≈ 51.8, Deck ≈ 53.9, Meta = provisional. Modifiers: Empty-board activation condition (-2). Final formula: 0.40*Intrinsic + 0.60*Deck

Strengths

• Turns any Level 4 or lower WATER monster in hand into a free Special Summon, adding a body on top of the Normal Summon.
• Repeatable every turn while it stays on the field, unlike a one-shot Spell.
• Cheap on deck slots (1.6 copies average) and played across many WATER archetypes, led by Ghoti at 49.2% of the sample.
• The summoned monster is immediately usable as Synchro or Xyz material (White Aura Whale, Stealth Kragen, Abyss Keeper partners).

Weaknesses

• Requires controlling no monsters to activate AND to resolve, so it is dead on any non-empty board.
• Requires a Level 4 or lower WATER monster in hand or the effect fizzles.
• Provides zero interaction, negation, or removal toward the opponent.
• No evidence of an in-archetype searcher; it must be drawn.
• Vulnerable to ordinary backrow removal, which removes the recurring engine.

Counters / choke points

• Ash Blossom & Joyous Spring / effect negation on the Special Summon
• Backrow removal (Cosmic Cyclone, Mystical Space Typhoon) to clear the Continuous Spell
• Any board state that leaves you controlling a monster, making the card unplayable
• Hand disruption that strips WATER monsters from the hand

Best use

First-turn free Special Summon engine / starter. Decks: Ghoti, Deep Sea, Atlantean, Umi Control. Suggested copies: 2.

Evidence & gaps

• Verified: Card text: once per turn, Special Summon 1 Level 4 or lower WATER monster from hand.; Card text: you must control no monsters to activate and to resolve this effect.; Card is a Continuous Spell with no archetype and 0 ATK/DEF.
• Observed: 63 of the sampled decks run it, all in the main deck, at an average of 1.6 copies.; Ghoti is the dominant home at 49.2% of decks, followed by Deep Sea (11.1%).; Top observed partners are White Aura Whale, Chengying, Called by the Grave and Lifeless Leaffish.; 0 combo appearances and 0 guides exist in the evidence.
• Inferred: It functions as a first-turn starter/extender only while the board is empty, adding one body beyond the Normal Summon.; Its material value is indirect: it produces a WATER body as Synchro/Xyz fodder but contributes no body itself.; It is effectively unsplashable outside WATER-heavy decks because of the hand-requirement and empty-board clause.
• Data gaps: no combos supplied — combo conversion is text-only inference no guides supplied no banlist token — assumed 3 copies (unlimited) no usage statistics (StatisticsCard) — archetype inclusion % inferred from deck sample only no measured average power index or starter count for boards containing the card