Forum:Black Rose Dragon vs. Book Of Moon/Eclipse

If Black Rose Dragon is Synchro Summoned and the turn player summoning it decides to activate its optional effect of destroying every card on the field and Book of Moon or Book of Eclipse (both of which would flip the Black Rose Dragon face-down) are chained to the activation of the effect, what happens? Please explain in detail and site relevant rulings, as I was unable to find any definitive answer to this question.97.104.91.133 (talk) 07:29, March 3, 2011 (UTC)