User blog comment:Yordleportal/Essence Reaver theory/@comment-25055281-20140705172834/@comment-3148314-20140705210648

"(Kayle does it with MagicDamage)"

Nope. Only the AD-part of her E procs the mana, I think. It should work similarly to Poppy's Q, where only her base damage procs ER while the bigger chunk of magic damage doesn't.