Forum:LaDD Negation effect is a must?

So im running a fun deck aka a random deck with only 1 trap card no spells and 39 monsters. I use 3 LaDD. So when its out it says when an effect of a card activates this card can negate it and this card loses 500 atk/def. Is this a must activate or can i choose not to negate? Alphabecta (talk • contribs) 03:08, October 21, 2011 (UTC)