Wind-Up Zenmaister (GENF-EN042)

2 Level 4 monsters

This card gains 300 ATK for each Xyz Material attached to this card. Once per turn: You can detach 1 Xyz Material from this card to target 1 face-up monster you control; change that face-up monster to face-down Defense Position, and if you do, during the End Phase of this turn, change it to face-up Attack Position.

Machine / Xyz / Effect, Generation Force