Downerd Magician

2 Level 4 Spellcaster-Type monsters During your Main Phase 2, you can also Xyz Summon this card by using a Rank 3 or lower Xyz Monster you control as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) This card gains 200 ATK for each Xyz Material attached to it. If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent. If this card attacks or is attacked, after damage calculation: Detach 1 Xyz Material from this card.