WATER
10Koitsu
ATK:
200
DEF:
100
View:
3691
Once per turn, during your Main Phase, if you control this card on the field, you can equip it to your "Aitsu" as an Equip Spell Card, OR unequip the Union equipment and Special Summon this card in face-up Attack Position. While equipped to a monster by this card's effect, increase the ATK of the equipped monster by 3000 points. When it attacks with an ATK that is higher than the DEF of a Defense Position monster, inflict the difference as Battle Damage to your opponent's Life Points. (1 monster can only be equipped with 1 Union Monster at a time. If the equipped monster is destroyed as a result of battle, destroy this card instead.)
Koitsu — Power Evaluation
Final Score: 38 ± 8 · Confidence: Medium
- Intrinsic: 40 · Deck: 37 · Meta: provisional
- Primary role: Extender · Secondary: Material body, Recovery/Recursion
Why it scores here
Koitsu's value is conditional: once per turn it can equip to Aitsu for +3000 ATK, or unequip a Union and Special Summon itself, so its power depends on Aitsu being present. The two sampled decks confirm the Aitsu link (100% co-deck rate), but no combo boards were recorded, so conversion is text-only inference. The 200 ATK and 100 DEF do not earn points; the score rests on the reusable equip-and-revive loop and its cost to build.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 40 | Live only when Aitsu or a Union is already on the field, with no searcher route in the evidence (inferred from text; 2 sampled decks, 0 combo appearances). |
| Combo & Conversion | 40 | The +3000 ATK equip to Aitsu is a large text-level payoff, but no recorded board confirms it converts in practice (inferred from text; combos absent). |
| Resource Economy | 30 | No draw, search or banish refuel in the text, and the Special Summon only recovers its own body (verified from text). |
| Effect & Interaction | 10 | No negation, removal or hand-trap effect (verified from text). |
| Material Utility | 35 | A Union body that can be swapped in and out of Aitsu, but no material-use data was recorded (inferred from text; combos absent). |
| Resilience & Flexibility | 30 | Destroyed with its equipped monster after battle and limited to one use per turn, so it is fragile (verified from text). |
| Deck-Building Efficiency | 55 | Two sampled decks ran 2 copies each, with no garnet or brick effect in the evidence, but it requires Aitsu-based builds (observed from decks, 2 of 2). |
Calculation
Weight profile: Extender primary role; no secondary blend applied. Intrinsic ≈ 40, Deck ≈ 37, Meta = provisional. Modifiers: Aitsu-dependent restriction (-2). Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Equip to Aitsu gives +3000 ATK per the text
- Can be re-summoned from the field once per turn, which gives some recovery
- Cheap to run at 2 copies in the sampled decks
Weaknesses
- Depends on Aitsu or a Union monster being present
- Destroyed with its equipped monster after battle
- Its 200 ATK and 100 DEF make it weak as a body on its own
- No combo or guide evidence of real conversion
Counters / choke points
- Negate effects
- Destroy the equipped monster in battle, which also destroys Koitsu
Best use
Extender for Aitsu Union lines. Decks: Aitsu-based Union decks, Armed Dragon builds, Ojama builds. Suggested copies: 2.
Evidence & gaps
- Verified: Once per turn Main Phase equip to Aitsu for +3000 ATK, or unequip a Union and Special Summon it; Destroyed with the equipped monster after battle; Two sampled decks each run 2 copies
- Observed: Aitsu is in both sampled decks (100% co-deck rate); Ran in 2 archetypes (Armed Dragon, Ojama)
- Inferred: Live mainly when Aitsu is already on the field; Summon-back loop gives limited recovery value
- Data gaps: no combos supplied, so combo conversion is text-only inference no guides supplied no usage statistics (StatisticsCard), so archetype inclusion is inferred from 2 decks only no banlist token, assumed 3 copies