Jungle graves a a very good late game champion if you farm a lot. with his masteries you will not be one shot but you will also deal out Tons of Damage. Many people will underestimate you but if you use his ability's to the fullest he is a great jungler.
This build works very well for me. It has a little health damage and Attack speed! Plus if you play it right and get "glimpse of the void" you will be unstoppable!
The masteries are a bit tanky but when you are late game with Sterak's Gage you will not regret picking it!