Sunset Beat (PHNI-EN086) - Phantom Nightmare 1st Edition

If a face-up monster you control is changed to face-down Defense Position: You can target 1 card on the field; destroy it. If a Flip monster(s) you control is flipped face-up, even during the Damage Step: You can target 1 of them; inflict damage to your opponent equal to its Level x 200. You can only use each effect of "Sunset Beat" once per turn.