[DRAGON/UNION] Once per turn, during your Main Phase, you can equip this card to a Machine-Type monster you control, OR unequip it to Special Summon this card in face-up Attack Position. While equipped to a monster by this card's effect, when the equipped monster destroys an opponent's monster by battle, select 1 Level 4 or lower LIGHTMachine-Type monster from your Graveyard, and Special Summon it. (Only 1 monster can be equipped with 1 Union Monster at a time. If the equipped monster would be destroyed, this card is destroyed instead.)