The problem with Yorick

Or at least one of his problems, is that a large portion of his kit is locked off in teamfights. The way most champions with summons works, is they scale with level. It keeps them from being too oppressive in lane, while giving them the ability to work well later in the game, and quickly set themselves up. For example, Heimer. Early on, you can only hold a single turret charge, and they take quite a bit of time to recharge. Late game, you can hold up to 3 charges, and they charge significantly faster. Yorick doesn't have that. The way he gains the ability to set up faster, is the amount of units to die decreases, from 12/8/4. And sure, that's great for when you are pushing down a lane, and you have the minions to get your minions. However, if the fight occurs literally anywhere else, you have no way to summon your minions. So, I propose this change:

P: Shepard of Souls Final Service: Yorick raises a Grave for every enemy champion and 12th/8th/4th non-champion enemy that dies near him, as well as for every enemy he kills with Last Rites. If Yorick leaves an area with active Graves, the Graves are stored in his cloak, up to a max of 4/8/12. Stored Graves are lost on death, and Yorick revives with his current max amount of stored Graves.