Koitsu

Ref: MFC-080

Once per turn during your Main Phase, if you control this Monster on the field, you can equip it to your Aitsu as an Equip Magic card, OR change it back to a Monster in face-up Attack Position. When equipped to a Monster by this cards effect, the Monster's ATK/DEF is increased by 3,000 points and when it attacks with an ATK that is higher than the DEF of a Defence Position Monster, inflict the difference in Battle Damage to your opponent's Life Points.

(One Monster can only be equipped with one Union Monster at a time. If the Monster that this card is equipped to is destroyed in battle, this card is destroyed instead).