Vallon, the Super Psy Skyblaster

[ Psychic / Xyz / Effect ] 2 Level 5 monsters During the Main Phase (Quick Effect): You can detach 1 material from this card, then target 1 face-up monster your opponent controls; change it to face-down Defense Position. If this card is sent to the GY: You can target 1 face-down card on the field; destroy it. You can only use each effect of "Vallon, the Super Psy Skyblaster" once per turn. ATK/ 2500 DEF/ 2200