You can Ritual Summon this card with Chaos Form . You can reveal this card in your hand; add 1 Dark Magician , or 1 non-Ritual monster that mentions it, from your Deck to your hand, then place 1 card from your hand on top of the Deck. When your opponent activates a monster effect (Quick Effect): You can return this card to the hand, and if you do, Special Summon 1 Dark Magician from your GY, and if you do that, negate that activated effect. You can only use each effect of Illusion of Chaos once per turn.