Cancerous Yorick's secret that you did not hear from me
Yorick's summons count as minions.
"Yeah, we know that, dumbass", you say, "towers will target siege minions before them".
But wait - there's more. They count as minions always and in every regard. Minions have three more wonderful, wonderful properties.
They won't draw tower aggro on you. They will attack a champion that uses basic attack on you. Towers never change their target priority when it comes to minions.
Which means that if you ever get any ahead as Yorick you can LITERALLY wait for next cannon wave, ult and start bashing enemy tower with your shovel.
And if enemy tries to stop you, your summons will chase them away. And the tower? Won't even look at you - or them - even if your enemy dies.
Just don't quaff corrupting.
99% of players will fall for this.