Spell
FieldVenom Swamp
Archetype:
Venom
View:
3148
During each player's End Phase: Place 1 Venom Counter on each face-up monster, except "Venom" monsters. Monsters lose 500 ATK for each Venom Counter on them. Destroy a monster if its ATK becomes 0 by this effect.
Venom Swamp — Power Evaluation
Final Score: 48 ± 8 · Confidence: Medium
- Intrinsic: 52 · Deck: 49 · Meta: provisional
- Primary role: Board breaker · Secondary: Floodgate / Control
Why it scores here
Venom Swamp converts a symmetric, board-wide effect into slow attrition: every End Phase it places a counter on each face-up non-Venom monster, so monsters lose 500 ATK per counter and are destroyed when their ATK reaches 0. It needs no targeting and no cost, and it is a single-slot card, but it is slow, it also hits the controller's own monsters, and no combo evidence exists to confirm it converts into a winning board. High base stats on the monsters it affects earn nothing here; the score comes only from the attrition mechanic and its deck fit.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 45 | Single copy in 10 of 10 decks and a Field Spell that must be drawn or searched; partners such as Terraforming and Gaia Power are named but their card text is not supplied, so the search route is unverified (observed, inferred). |
| Combo & Conversion | 30 | No recorded boards, so conversion is text-only: a repeated per-End-Phase counter build that removes a monster only after several turns (verified, inferred). |
| Resource Economy | 30 | No card draw, refuel, or cost return; the effect is a passive board effect with no card advantage in the evidence (verified). |
| Effect & Interaction | 55 | Board-wide, non-targeting removal of monsters over time that is hard to answer with a single interaction, but it is slow and symmetric (verified, inferred). |
| Material Utility | 5 | A Spell with no material role; the body is irrelevant to this card's value (verified). |
| Resilience & Flexibility | 40 | A continuous Field Spell that can be removed by any field-destruction effect; the counters persist across turns, which gives some multi-turn value (inferred). |
| Deck-Building Efficiency | 65 | One copy, no garnet or lock, no cost to run; the self-harm on the controller's own non-Venom monsters is the main cost to play around (verified, inferred). |
Calculation
Weight profile: 0.7 Board breaker + 0.3 Floodgate / Control. Intrinsic ≈ 52, Deck ≈ 49, Meta = provisional. Modifiers: Symmetric self-harm (-2). Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Board-wide, non-targeting attrition that removes monsters regardless of their ATK over several End Phases
- Single-slot card with no cost, garnet, or self-lock
- Consistent inclusion across 10 decks and 5 archetypes, with Cyber Dragon and Mystical Space Typhoon in 8 of 10 decks
Weaknesses
- Slow: it only acts at End Phases and needs counters to accumulate before any monster is destroyed
- Symmetric: it also weakens and destroys the controller's own non-Venom monsters
- Field Spell that can be removed or replaced; no evidence of resilience in the recorded decks
- No combo, guide, or ruling evidence to confirm how it converts in practice
Counters / choke points
- Venom monsters are exempt from the counter, so a Venom-based board is unaffected
- High-ATK monsters survive several End Phases, and swapping them out before the next End Phase avoids the effect (inferred)
- Removing or replacing the Field Spell stops the attrition (generic, card text for specific answers not supplied)
Best use
Board-wide attrition / floodgate against opposing monsters. Decks: Machina, Ancient Gears, Sacred Beast, Cyber Dragon. Suggested copies: 1.
Evidence & gaps
- Verified: Card text: during each player's End Phase, place 1 Venom Counter on each face-up monster except Venom monsters; each counter gives -500 ATK; a monster is destroyed if its ATK becomes 0 by this effect; Run at 1 copy in 10 of 10 decks, all in the main deck
- Observed: Archetype spread: Machina 3, Ancient Gears 3, Sacred Beast 2, Cyber Dragon 1, no archetype 1 (5 distinct archetypes); Cyber Dragon and Mystical Space Typhoon in 8 of 10 decks; several Machina and Ancient Gear partners in 7 of 10
- Inferred: A monster with 1000 ATK is destroyed after two counters, and a monster with 500 ATK after one (arithmetic from the stated text); Field-based attrition favours decks that want to clear the field over time, not decks that need immediate board presence
- 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 the 10-deck sample only Terraforming and Gaia Power are named only as partners; their card text is not supplied, so their search or access role cannot be verified no rulings supplied to confirm Field Spell timing or interaction with replaced or destroyed Field Spells