Forum:Counter Trap timing

My opponent summons The Agent of Creation - Venus and I have Solemn Warning face down. I want to activate the Warning and my opponent wants to activate Venus's effect with priority. Do I have to activate Warning before my opponent chooses to activate his effect, or can I chain warning to Venus's effect? 82.35.91.113 (talk) 16:15, August 9, 2011 (UTC)