Spell
ContinuousSudden Thunder Swamp
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1514
When this card is activated: You can discard 1 card, and if you do, Set 1 Continuous Trap from your Deck or GY, with an effect that Special Summons itself as a monster, except the discarded card. If a card(s) you control is destroyed by battle or card effect, and sent to the GY or banished face-up: You can target 1 of them; add 1 card with the same name from your Deck to your hand. You can only use this effect of "Sudden Thunder Swamp" once per turn. You can only activate 1 "Sudden Thunder Swamp" per turn.
Sudden Thunder Swamp — Power Evaluation
Final Score: 58 ± 8 · Confidence: Medium
- Intrinsic: 55 · Deck: 60 · Meta: provisional
- Primary role: Extender · Secondary: Searcher/Tutor
Why it scores here
The card's main value is turning a discarded hand card into a face-down Continuous Trap that Special Summons itself as a monster, so it extends the board from a card that would otherwise be dead. Its once-per-turn search of a same-name card from the Deck after a destruction adds a conditional +1 that only fires when something you control is destroyed. Its 209-deck presence (84% in one gameplay type, 81.8% co-appearance with Apophis the Swamp Deity) confirms it is a live, practical staple, but that popularity does not raise the score. It has no negation or removal, no combo evidence, and the summoned body's stats are not in the evidence, so the score stays in the middle.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 62 | It is a Spell in hand with 209 decks and a 1.75 average copy count, but it has no searcher route in the text and no as_starter or as_searched data (observed plus inferred). |
| Combo & Conversion | 42 | Discard-to-body conversion is clear from the text, but no combo boards were recorded, so the extent of the board it builds is text-only inference (inferred). |
| Resource Economy | 58 | The discard cost is a -1 and the body is a conversion rather than a gain, while the destruction search gives a conditional +1 once per turn (verified text, inferred net). |
| Effect & Interaction | 18 | The text has no negation, removal, or hand-trap effect, so it offers no direct opponent interaction (verified). |
| Material Utility | 30 | The summoned monster's level, attribute, and race are absent from the evidence, so its material value cannot be confirmed (inferred, low confidence). |
| Resilience & Flexibility | 60 | The search works on destruction by battle or effect and from Deck or GY set, which spreads it across zones and turns, but the once-per-turn limits cap it (verified text, inferred). |
| Deck-Building Efficiency | 62 | It runs 1 to 3 copies in the 209 decks, with 2 to 3 typical in the usage sample and no garnet or lock restriction in the text (observed plus verified). |
Calculation
Weight profile: 0.7 Extender + 0.3 Searcher/Tutor. Intrinsic ≈ 55, Deck ≈ 60, Meta = provisional. Modifiers: none. Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Converts a discarded hand card into a face-down monster body from Deck or GY
- Once-per-turn search of a same-name card after a destruction gives conditional card advantage
- Live in 209 recent decks across 39 archetypes, with 84% in one gameplay type
- Low deck-building cost at 1 to 3 copies with no garnet or lock restriction
Weaknesses
- No negation, removal, or hand-trap effect of its own
- Discard cost is a real -1 card, and the body is not a clear card gain
- Two once-per-turn limits restrict repeat use
- Heavy co-appearance with Apophis and Argostars means its real value may depend on that home
Counters / choke points
- Interaction that destroys or negates the Continuous Trap or summoned body before it resolves
- Board wipes that deny the destruction trigger the search needs
Best use
Extender. Decks: Argostars, Apophis, Temple of the Kings, Eldlich. Suggested copies: 2.
Evidence & gaps
- Verified: Discard 1 card to Set a Continuous Trap from Deck or GY that Special Summons itself as a monster; Once-per-turn search of a same-name card from Deck after a battle or effect destruction; Present in 209 decks, 84.2% in gameplay type 7, across 39 archetypes; Average 1.75 copies per deck with a maximum of 3
- Observed: Co-appears with Apophis the Swamp Deity in 81.8% of decks and Statue of Anguish Pattern in 81.3%; Usage statistics show 100% inclusion in 3 small gameplay-type-4 archetype samples
- Inferred: The discard-to-body conversion is roughly net-neutral in cards, with the destruction search as the conditional gain; Its 39-archetype spread suggests portability, though the text is tied to destruction triggers
- Data gaps: No combos supplied, so combo conversion is text-only inference No guides supplied No banlist token, so 3 copies assumed Level, attribute, race, and stats of the summoned Trap monster are not in the evidence legal_copies is empty Usage statistics sample for gameplay type 4 is small (5 archetypes)