Once per turn, you can either: Target 1 monster you control; equip this card to that target, OR: Unequip this card and Special Summon it. If the equipped monster would be destroyed by battle or card effect, destroy this card instead. While this card is equipped to a monster: You can banish this card; equip an appropriate Level 4 or lower Union monster from your Deck to the monster that was equipped with this card. You can only use this effect of "Union Driver" once per turn.
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