Not bad... smiler to the one I have up but i dont go for frozen mallet, and also do a 9/21/0. I find the frozen malet to be pointless do to the knock up and the dash. Instead getting black cleaver first and then getting a last whisper for the added attack speed and armor pen. This will help with W's lowering cooldown's.

Hey Nice build, but i use 9/21/0 which also works did you ever try using 9/21/0 with Xin?