When you Xyz Summon a monster: You can Special Summon this card from your hand. Once per turn: You can detach 1 Xyz Material from a monster you control, then target 1 face-up Xyz Monster on the field; reduce its Rank by 1, and if you do, it loses 300 ATK.
How to Get
Detaches Xyz Materials for cost
Special Summons itself from your hand
Your monsters lose Ranks / Your opponent's monsters lose Ranks / Your monsters lose ATK / Your opponent's monsters lose ATK