Overlay Sentinel (LVAL-EN005) [Legacy of the Valiant]

Cannot be Special Summoned. When this card is Normal Summoned: Change this card to Defense Position. If you control a face-up Xyz Monster that has Xyz Material: You can banish this card from your Graveyard, then target 1 face-up monster your opponent controls; that monster loses 500 ATK for each Xyz Material currently attached to a monster you control.