Ayat al-Kursi is the most powerful Ayah in the Qur’an and its effects on punishing the evil ones from the shayateen are great.
The Prophet ﷺ said that Ayat Al-Kursi is the hump of the Qur’an (meaning it is the pinnacle of it) [Tirmidhi]
The Prophet ﷺ confirmed the shaytaan’s mentioning to Abu Hurayrah that Ayat Al-Kursi protects one all night if recited before sleeping [Bukhari]