Started in season 4. Picked up Yorick around season 5. One season later right after getting m7 on Yorick he gets reworked. I peaked in season 9 getting Gold 3-4. Other than that I've been stuck in silver.

This build allows you to get maximum ability haste on Yorick. Even with the nerfs, especially with the nerfs, this build is the strongest. Even more so if you are good at landing E's. With the nerfs you get 40% increased damage from mist walkers for 8 attacks. But if E is 4 seconds or less that is way less time than it takes for mist walkers to do 8 attacks. Basically you will always have 40% increased mist walker damage if you can sustain the curse mark on a target.

Runes : +18 Ability Haste +31 Ultimate Ability Haste
Duskblade : +20 Ability Haste
+20 Ability Haste from Mythic Passive
Ion Boots : +20 Ability Haste
Navori : +30 Ability Haste 20% chance to reduce ability cooldowns by 20% by crit
BC : +25 Ability Haste
Grudge : +20 Ability Haste
Rav Hydra : +20 Ability Haste
Blue Buff : +10 Ability Haste
Total : 173 Ability Haste|204 Ability Haste for Ultimate

Q Final CD: 1.465 seconds
W Final CD: 4.395 seconds
E Final CD: 2.930 seconds
R Final CD: 32.894 seconds | 28.409 seconds (+48 ultimate AH 4 cloud drakes)

If you lose lp with this build you aren't playing Yorick right or you are getting bad teammates.