Wind-Up Zenmaister (CT08-EN002) [2011 Collectors Tins]

2 Level 4 monsters
<br>This cards gains 300 ATK for each of its Xyz Materials. Once per turn: you can detach 1 Xyz Material from this card to select 1 face-up monster on the field that you control; Flip that monster into face-down Defense Position. During the End Phase of this turn, change it to face-up Attack Position.