Well that’s definitely a new take on genjutsu — casting it on yourself. It’s almost like putting yourself in denial about your death, except it actually works! Interesting how the technique is basically Sasuke’s “I’ll make my dream into a reality” bit that he was spouting to Itachi before. I made a joke about forbidden techniques last chapter, but given the cost of Izanagi (i.e. having your eye close forever), it lives up to the classification I guess. I’m starting to wonder if “forbidden” is synonymous with “self-damaging” though, in which case Naruto’s original Rasen-Shuriken should fall under that.
In any case, Madara did hint at the idea that the eyes on Danzou’s arms would regenerate over time, but I’m more curious as to why he doesn’t pull off a completely ridiculous attack to end the fight if he can use Izanagi for offense too. I realize the flip side is that he’s using it just to stay alive, but all he’d need is one opening to use the 60 second “cooldown” for a sure-kill attack. I’m under the impression that it’s only restricted by what he can imagine, which should mean the possibilities are endless.
As for Sasuke, having a plan is more inline with what I expected; however, I still think letting it come down to a battle of endurance is somewhat reckless for him. Maybe some of Naruto’s ways that rubbed off on him still remain after all these years.