2 Level 5 monsters
Once per turn, you can also Xyz Summon "Drill Driver Vespenato" by using 1 Rank 4 Xyz Monster you control as material. (Transfer its materials to this card.) This card cannot be used as material for an Xyz Summon the turn it was Xyz Summoned. If this card attacks a Defense Position monster, inflict piercing battle damage. If this Xyz Summoned card in its owner's control is destroyed by an opponent's card: You can target 1 Level 5 or lower monster in your GY; Special Summon it. You can only use this effect of "Drill Driver Vespenato" once per turn.