Does Mikael's passive healing bonus increase self Lifesteal gained from items?

I believe so. It should be the same with Windspeakers Blessing too.

Who is Mikael?

yes

the real question is though

why would you need both i mean you cant use the item if ur stunned

Then again i suppose could work vs slows and roots but the cooldown is so damn long

heheh just used it on swain in a aram match vs a full ap team... i had fun