Forum:A Compulsory Evacuation Device Q

scene: opponent summons "Card Trooper" and wants to use its effect but I don't want him to...

The Question: when can I use "Compulsory Evacuation Device"?


 * can I use it after he summons the monster (not as chain response) to prevent the effect?..

120.28.64.74 (talk) 16:44, November 28, 2012 (UTC)