I do not know, remember much of the Al-Qur'an. What i know is just left with my post here. So, based on my knowledge, Iblis wants, desire human to accompany him in the HellFire/Naar. (Please add more if there are something i do not know/remember. And the tactic/strategy is : 1. Iblis afraid of taking the burden of responsibility for deceiving human, so he set up in many ways that all of each human decision which devastate human and give benefit to Iblis do not have any relation to him. (So the responsible actor is only himself/each human). 2. Please add more.