Shaykh Yasir Qadhi acquaints us with immense clarity the following dua for protection against Shaytan in the Qur'an.
And say, "My Lord, I seek refuge in You from the incitements of the devils,And I seek refuge in You, my Lord, lest they be present with me.
[Surah Al Muminun, Verses 97 - 98]
This lecture explicitly illustrates the need for Istia'dhah before reciting the Qur'an.
Also, the wisdom behind creating the entity called Shaytan is as follows:
Allah is manifesting the diversity of His Qudrah.
To have an actual and real enemy that is alive which will make us more conscious and aware of our actions.
Good is only appreciated when it is contrasted with the evil. True piety will only shine in this circumstance.
The tactics used by Shaytan to allure us are also discussed in immense detail and makes for a very interesting listen.