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Once per turn, you can either: Target 1 face-up Monster Card|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. You can banish this Equip Card; equip 1 appropriate Level 4 or lower Union monster from your Main Deck|Deck to the monster this card was equipped to. You can only use this effect of "Union Driver" once per turn.