Maestroke the Symphony Djinn (YS12-EN043)

2 Level 4 monsters

Once per turn: You can detach 1 Xyz Material from this card, then target 1 face-up Attack Position monster your opponent controls; change it to face-down Defense Position. If a "Djinn" Xyz Monster you control would be destroyed, you can detach 1 Xyz Material from that monster instead.

Fiend / Xyz / Effect, Starter Deck: Xyz Symphony