Spell
FieldThe Hidden City
Archetype:
Subterror
View:
3764
When this card is activated: You can add 1 "Subterror" monster from your Deck to your hand. Once per turn: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position. Once per turn, when an opponent's monster declares an attack: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position, then you can negate the attack. You can only activate 1 "The Hidden City" per turn.
The Hidden City — Power Evaluation
Final Score: 63 ± 6 · Confidence: Medium
- Intrinsic: 62 · Deck: 64 · Meta: provisional
- Primary role: Searcher/Tutor · Secondary: Combo enabler, Negation/Interaction
Why it scores here
The Hidden City earns its score as the near-mandatory engine piece of the Subterror archetype: activating it adds any "Subterror" monster from the Deck to the hand, and once per turn it flips a face-down "Subterror" body face-up to drive the deck's flip-based loops, with a situational attack-negate layered on top. It is run in essentially every deck in the sample (400/400, avg 2.88 copies) and is easily found via Terraforming, so its accessibility — not raw stats, of which it has none — is what carries it. The card is not a generic staple: its search and flip effects are name-locked to "Subterror", so portability and material utility are low. No combo data was supplied, so the conversion and resilience sub-scores rest on card-text inference rather than observed board results.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 84 | Present in 400/400 sample decks at 2.88 average copies and findable via Terraforming (68.2% co-deck), and its own activation tutor picks up any "Subterror" monster (verified text + observed deck stats). |
| Combo & Conversion | 70 | On activation it tutors a "Subterror" monster and its flip effect sets up the deck's flip engine, but there is no combo evidence to confirm the resulting board size (inferred from text; combos_evidence = 0). |
| Resource Economy | 60 | Activation is a one-for-one search that replaces the card used, with the recurring flip adding soft tempo rather than measurable card advantage (inferred from text). |
| Effect & Interaction | 40 | The once-per-turn attack negate only works when an opponent attacks into a face-down "Subterror" you control, so disruption is situational and soft (verified text). |
| Material Utility | 12 | It is a Field Spell with no body, Level, or Attribute, so it contributes nothing as material and its value is purely the effect it enables (verified text). |
| Resilience & Flexibility | 55 | As a Field Spell it stays on board for multi-turn value but is a single point of failure vulnerable to backrow/field removal, and the whole line depends on it (inferred from text). |
| Deck-Building Efficiency | 72 | It is a clean, cheap near-mandatory 3-of that is redundant at three copies with no self-locking restriction, but its effects are entirely archetype-locked to "Subterror" (verified text + observed deck stats). |
Calculation
Weight profile: 0.7 Searcher/Tutor + 0.3 Combo enabler. Intrinsic ≈ 62, Deck ≈ 64, Meta = provisional. Modifiers: none. Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- On-activation search of any "Subterror" monster makes it the deck's main consistency tool
- Recurring once-per-turn flip effect drives the Subterror flip engine and behemoth summon loops
- Situational attack negate provides a small defensive layer for a control deck
- Easily accessed as a Field Spell via Terraforming and protected by pot cards
Weaknesses
- Both search and flip effects are name-locked to "Subterror", so it is useless outside the archetype
- The attack negate requires an opponent to attack into a face-down "Subterror" you already control
- Only 1 copy can be activated per turn, and it is a single vulnerable Field Spell
- Being a Spell, it provides no body, Level, or Attribute for material plays
Counters / choke points
- Backrow/Field Spell removal (e.g. Cosmic Cyclone, Harpie's Feather Duster) turns off the flip engine
- Hand traps such as Ash Blossom & Joyous Spring can stop the on-activation search
- Floodgates that prevent searching or Field Spell usage, such as There Can Be Only One-style pressure or Anti-Spell effects
- Removing the searched "Subterror" monsters before the flip loop starts
Best use
Archetype Field Spell searcher and flip-engine enabler. Decks: Subterror. Suggested copies: 3.
Evidence & gaps
- Verified: Activation adds 1 "Subterror" monster from Deck to hand; Once per turn flips a face-down Defense Position "Subterror" you control face-up; Once per turn, on an opponent's attack, flips a face-down "Subterror" and can negate the attack; You can only activate 1 "The Hidden City" per turn; It is a Field Spell with no ATK/DEF/Level and no material utility
- Observed: Ran in 400/400 sample decks, avg 2.88 copies, 356 decks at 3 copies; Co-decked 100% with Subterror Fiendess and Subterror Guru, 99% with Subterror Final Battle; Terraforming appears alongside it in 68.2% of decks; 34 distinct archetype labels in decks_evidence, dominated by Subterror variants
- Inferred: Its search is the deck's primary consistency route given the lack of a dedicated in-archetype searcher in the text; The flip effect converts face-down Subterror bodies into active behemoth/loop pieces; Portability is low despite 34 archetype labels because the text is name-locked to "Subterror"
- Data gaps: no combos supplied — combo conversion is text-only inference no banlist token — assumed 3 copies (unlimited) no usage statistics (StatisticsCard) — archetype inclusion % inferred from deck sample only