Heavy Mech Support Platform [SDGR-EN019] Common

Once per turn, you can either: Target 1 Machine-Type monster you control: equip this card to that target, OR: Unequip this card an Special Summon it in Attack Position. While equiped by this effect, the equipped monster gains 500 ATK and DEF. (A monster can only be equipped with 1 Union monster at a time. If the equipped monster would be destroyed, destroy this card instead.)