Most Cursed Techniques in Jujutsu Kaisen are already pretty dangerous to go up against. From techniques that can slice a person up into tiny little pieces to others that overload the brain with so much information that the person on the receiving end just gets their brain fried, danger lurks in every corner of this world. So, it says a lot when Mahito's Idle Transfiguration is often called the most dangerous of them all.