An idea for a Yorick rework

Ok, I know there a about a million of these but, how about one more? I feel that Yorick is really weak at the moment,really strong laning phase, but worthless late unless he is insanely fed.

Pasive: Grave Children, Each of Yorick's basic attacks apply an untargetable ghoul to and enemy unit the unit will deal magic damage to that unit for .5/1/1.5/2/2.5/3/3.5/4/4.5/5 seconds(scaling stops at level 10) Q:Dirt fling, Yorick flings a plie of dirt that for 40% and deals 70/90/130/150/170(+.65 ap) W: Undead Furry, Yorick gains bonus attack speed (would scale with as) and damage(would scale with ad) for 1.5/2/3/4/5 seconds E: Dig a Grave, Yorick charges forward and knocks back all enemies and leaves a slowing field for 3 seconds (scales with ad) R:Mortician, Yorick targets and enemy and digs underground to reach them, upon comtact Yorick knocks his target airborne and deals damage (this might be a bit to much like 's ult) Please tell me what you think!:)