Since the update, this character has become stronger and therefore I decided to start playing with it and experimenting and this was the build I enjoyed the most.

Pros:
Yorick CAN maintain a lane against 2 chars
Yorick CAN kill 2 characters alone
Yorick CAN chase
Yorick CAN harass in the early, mid and late game

Cons:
Yorick is a bit squishy in the early game
Yorick is unable to go against 2 characters alone if he doesn't have his ultimate

Well, I suck at picking runes, that's the truth, so I just used attack damage runes, seals and glyphs to make yorick slightly more effective and quintesses for health because he is squishy in the early game and I don't like buying doran's stuff.

I ALSO suck at picking masteries so I just went with 21 - 9 - 0 (to increase damage dealt and slightly reduce the "squishyness")

I'm a little bit better at picking out items. For this build, you are going to start by buying Meki Pendant to increase your mana regeneration so you can keep harassing your lane enemies with your zombies for a long time.
Once you get enought money buy Manamune... BOOM, huge attack damage and yorick is now becoming a serious threat to your enemies. Mantain the harassment, buy Berserker's Greaves and then buy Sheen... BOOM, your burst damage is greatly increased buy Sheen and you have just become a dangerous 1v1 character. Improve Sheen to Trinity Edge... BIGGER BOOM, you are now suited to kill 2 enemy characters alone. The rest of the items reduce the "squishyness" and increase the damage output.

Designed for harassment and to get some kills in the early game (still, don't get cocky and chase your enemies into their turret)

Either chase with then or run with them. Simple.

Grea in team battles, and farms like hell!

YORICK RULES (not gonna buy it though, I'm waaay too lazy to stockpile 6000 IPs)