Show Yorick some <3
I really like his kit. Its unique but it feels very out dated. I think some points to look at might be his low hp or possible making his Omen of Pestilence apply a 0.5 stun that has like a 6 second cool down on the stun. Its an aoe and it would make him more viable in team fights. He can spam his skills which i like but burns mana faster then Kog'maw (maybe not that fast). He can put pressure well but without relying on his Omen of War to chase or trade well. He can't kill unless someone else with some CC to lock them down from running or if they have no flash and they are not full health.
Also this would be a great skin that would be an awesome legendary skin. Just throwing that out there.