Forum:"Activate only when a monster attacks"

I declare a attack with breaker and use priority to use BoM on my opponent's monster. Can my opponent use Mirror force? How about Magician's circle?

Can I use magician's circle in this situation if my opponent chooses not to activate anything after I attack and activate BoM?24.193.88.193 03:37, February 28, 2010 (UTC)