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
- Oct 10, 2003
- 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.)
YGOPRODeck card-level price
≈$0.49 lowest USD figure across marketplaces, for no one printing
YGOPRODeck recorded a lowest available USD card-level price hint of ~$0.49 on Oct 26, 2026 (historical, not a printing-specific quote). It varies with printing, condition, edition, rarity, and grading. Check current listings before buying or selling.
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Printings & rarities
| Set | Set code | Rarity | Release | Price* | Buy |
|---|---|---|---|---|---|
| Magician's ForceMFC-080 · Short Print · Oct 10, 2003 | MFC-080 | Short Print | Oct 10, 2003 | ~$5.40 1st Edition~$1.41 Unlimited | Buy on TCGplayerSearch eBay |
| Dark Revelation Volume 1DR1-EN135 · Common · Mar 19, 2005 | DR1-EN135 | Common | Mar 19, 2005 | ~$0.66Unlimited | Buy on TCGplayerSearch eBay |
*Approximate price hints, not appraisals. A price with a finish (1st Edition, Unlimited, Limited) is TCGplayer's for that set code, rarity and finish, via TCGCSV, updated Oct 26, 2026. A price marked YGOPRODeck is YGOPRODeck's figure for that printing. A dash means that printing has no price yet. Buy links are affiliate links.
Price hint history
Dated YGOPRODeck snapshots. These hints are not sales or market values.
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Koitsu in other languages
| Japanese | コイツ |
| Korean | 코이츠 |
| German | Koitsu |
| French | Koitsu |
| Italian | Koitsu |
| Spanish | Koitsu |
| Portuguese | Koitsu |