Forum:Skill drain vs. cyber valley

I thought you couldn't activate monster effects while skill drain was on the field unless it removed itself with it's own effect as soon as it came out. My confusion came from a feature match where one player had a skill drain out and still activated his cyber valley when it was attacked by a gladiator beast. Someone please explain. 76.126.47.20 09:21, 10 August 2008 (UTC)