Spell
FieldRevolving Switchyard
Archetype:
Train
View:
4971
If a Level 10 EARTH Machine monster(s) is Normal or Special Summoned to your field (except during the Damage Step): You can activate this effect; your opponent takes no battle damage for the rest of this turn (even if this card leaves the field), also you Special Summon 1 Level 4 EARTH Machine monster with 1800 or more ATK from your Deck, and if you do, it becomes Level 10. You can send 1 card from your hand to the GY; add 1 Level 10 EARTH Machine monster from your Deck to your hand. You can only use 1 "Revolving Switchyard" effect per turn, and only once that turn.
Revolving Switchyard — Power Evaluation
Final Score: 59 ± 6 · Confidence: Medium
- Intrinsic: 60 · Deck: 64 · Meta: provisional
- Primary role: Searcher/Tutor · Secondary: Combo Enabler, Resource Generator
Why it scores here
Revolving Switchyard scores as a high-utility tutor and resource generator in EARTH Machine strategies, where it achieves near-universal inclusion (100% in six core archetypes across 42+ distinct homes total). The card reliably searches Level 10 EARTH Machines from Deck and generates bodies on trigger, sustaining combo lines in Train, Machina, Crystron, and Railway variants. However, battle damage prevention is passive utility rather than active disruption, and the field spell frame creates vulnerability to removal. The absence of combo data prevents empirical confirmation of its combo power, though consistent guide mentions and 100% deck inclusion strongly suggest practical value.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 55 | 100% deck inclusion in six core archetypes and live search effect from hand enable reliable access, verified by deck evidence and guide mentions (observed). |
| Combo & Conversion | 60 | Generates Level 10 bodies and maintains resource flow in EARTH Machine decks featured across six guides, though no empirical combo data limits direct confirmation (inferred). |
| Resource Economy | 65 | Discard-for-tutor search is net-neutral on hand, but generating free bodies on Level 10 trigger provides card advantage in dedicated synergy lines (verified). |
| Effect & Interaction | 35 | Battle damage prevention is passive utility without active opponent interaction or disruption capability (verified). |
| Material Utility | 45 | Field Spell frame precludes material use, and the card contributes no levels, attributes, or type-based synergy beyond effect activation (verified). |
| Resilience & Flexibility | 50 | Field spell vulnerability to wipes is offset by the search effect's always-live status when held in hand, limiting resilience loss (verified). |
| Deck-Building Efficiency | 70 | No garnet risk and clean integration into EARTH Machine strategies at typical 1-copy inclusion, though archetype-specific design limits broader splashability (observed). |
Calculation
Weight profile: 0.7 Searcher/Tutor + 0.3 Combo Enabler. Intrinsic ≈ 60, Deck ≈ 64, Meta = provisional. Modifiers: Missing combo data (-4); Field spell vulnerability (-2); EARTH Machine archetype fit (2). Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Universal inclusion in core EARTH Machine archetypes (100% in Train, Machina, Crystron, Scrap, R.B., Earth Machine)
- Reliable tutoring from Deck and body generation in a single card
- Search effect is always live when held in hand, preventing dead draws
- Supports both OTK strategies (via Level 10 spamming) and resource-refresh midrange lines
- Battle damage prevention enables turn 2 aggressive strategies
Weaknesses
- Field Spell status creates vulnerability to field wipes and removal effects
- Trigger effect is tightly coupled to Level 10 EARTH Machine summoning, reducing flexibility outside the archetype
- Once-per-turn hard lock limits turn extension and combo scaling
- Search effect costs hand resources (discard), preventing pure card advantage
- Not splashable outside EARTH Machine decks; zero generic utility
Counters / choke points
- Cosmic Cyclone (destroys field spell preemptively)
- Harpie's Feather Duster (field wipe)
- Forbidden Droplet (negates field spell effect)
- Ash Blossom & Joyous Spring (negates Level 10 searches)
Best use
Core engine piece for Level 10 EARTH Machine tutoring and board generation. Decks: Train, Machina, Crystron, Earth Machine, Railway, Infinitrack, R.B.. Suggested copies: 1.
Evidence & gaps
- Verified: Field Spell type; cannot serve as Synchro, Fusion, or Xyz material; Once-per-turn hard lock stated in official card text; 100% inclusion in Train, Machina, Crystron, Scrap, R.B., and Earth Machine per usage_statistics; 400/400 sampled decks include this card in main deck; Legal in TCG, OCG, MasterDuel, and DuelLinks formats; Trigger effect requires Level 10 EARTH Machine Normal or Special Summon; search effect requires hand discard
- Observed: 42 distinct archetypes run this card across 400 deck samples; Average 1.14 copies per deck; most decks run exactly 1 copy (90.75%); Top 10 partners include Night Train Blue Traveler at 99.8% co-deck rate, indicating tight Level 10 generator synergy; Guides consistently feature this card in EARTH Machine core sections, not side tech; Gameplay distribution: 50.2% control, 29.5% combo, 20.2% positional
- Inferred: Search effect is always live from hand, preventing dead draws in any EARTH Machine list; Battle damage prevention enables OTK strategies in go-second gameplans; Level 10 generation feeds into Xyz rank-10 strategies (Railway and Infinitrack are Xyz-heavy); Field spell vulnerability is partially mitigated by archetype-specific protection; The card is a linear tutor without redundancy, meaning EARTH Machine consistency depends on it
- Data gaps: No combos supplied — combo conversion is text and deck-based inference only, not empirical board power verification No banlist information — assumed legal at 3 copies (unlimited) across all formats No format-specific performance breakdown (TCG vs. OCG vs. MasterDuel vs. DuelLinks) No guide snippets detailing actual combo mechanics or synergy lines involving this card No top-card rankings supplied; cannot confirm format-level impact