Here is a great place to discuss your favorite monster and effect monster cards.
You guys have misread the card. It cannot be targeted OR destroyed by your opponent's card effects. Which means that, if your opponent activates raigeki, mirror force or Dark Hole, he would not be destroyed. He/she also cannot use cards like Book of the Moon on him because it would target him. However, if you use cards like Wall of Disruption, which does not target or destroy, or you use Dark Hole as its owner, it would be affected.