Koitsu
Union Effect Monster
Koitsu is a Union Effect Monster (WATER/Fairy, Level 10) with 200 ATK / 100 DEF. First printed in Magician's Force (2003).
- Type
- Union Effect Monster
- Attribute
- WATER
- Monster type
- Fairy
- Level
- 10
- ATK / DEF
- 200 / 100
- Banlist
- Unlimited in the TCG, OCG, and Master Duel
- TCG release
- 2003-10-10
- Printings
- 2
Card text
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.)
Approximate value
≈$0.49
A rough figure from recent listings (updated 2026-07-26), not a market value or official price. It varies a lot with printing, condition, edition, rarity, and grading. Check current listings below before buying or selling.
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Printings & rarities
| Set | Set code | Rarity | Release | Price* |
|---|---|---|---|---|
| Magician's Force | MFC-080 | Short Print | 2003-10-10 | $3.51 |
| Dark Revelation Volume 1 | DR1-EN135 | Common | 2005-03-19 | $0.49 |
*Approximate, from recent marketplace listings, not market values.
Koitsu in other languages
| Japanese | コイツ |
| Korean | 코이츠 |
| German | Koitsu |
| French | Koitsu |
| Italian | Koitsu |
| Spanish | Koitsu |
| Portuguese | Koitsu |