Hi!
This is my first build guide on MobaFire, and is for an Off Tank Yorick.
Yorick is definitely one of my favorite champions in the game because of his versatility and general play style.
In this guide I'm going to show you why Yorick is one of my favourite champions and how fun it he is to play and that you should give him a try instead of calling him a 'Troll Pick'.

The work of gravediggers is essential amongst the living, but invaluable in the Shadow Isles. There are many shades of death there, and each is embraced rather than feared or reviled. One can only ascend from one state to the next with the magical aid of a skilled professional. At the end of the first Rune War, Yorick Mori made his living as a gravedigger. His family owned and maintained the Final Rest Memorial, one of the oldest cemeteries in Valoran. The shovel he employed for his work had been passed down for generations. Each gravedigger taught his son that this shovel was imbued with the spirit of every forefather, and that those spirits would protect him during the long lonely nights amongst the tombstones. To his eternal regret, Yorick died without an heir, bringing the proud Mori line to a close. His body was interred with his shovel in the family mausoleum, and the Final Rest Memorial soon fell to ruin. Death, however, was not the end Yorick had expected.

Yorick emerged on the haunted shores of the Shadow Isles – not quite dead, definitely not alive – still clutching his beloved shovel. He soon learned that with it he could act as a ferryman for the Isles' undead denizens, helping them climb death's many-tiered ladder. This proved a curse, as a gravedigger must "bury his quota" before he too can ascend, or so the legend goes. No one knows what "his quota" is. Yorick dug tirelessly, waiting in vain for the day when he would be freed of his burden. As decades turned to centuries, the shame of his failures came to a head. He returned to Valoran to find his corpse, convinced that salvation might be buried with it. When he arrived, no trace remained of either the mausoleum or the memorial. Hope nearly lost, he discovered the League of Legends, and there saw an opportunity to immortalize the family name he allowed to be forgotten ages ago.

"Die first, then we’ll talk."
― Yorick

Pros:

• Great sustain all-round
• One of the best harass
• Can 1v1 most champions and win
• Good slowing ability
• Great passive (If used correctly)
• Strong kiting capabilities

Cons:

• Hard to counter a gank
• Takes a while to perfect using Omen of Death
• Very mana hungry

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Mark of Attack Damage:

• I use this mark almost always when I'm top laning, especially against other Off Tanks as it gives me that slight upper hand at the start of the game and has the potential to get first blood or save your life during a gank.

Seal of Armour:

• Just like the mark, I always use this on top lane (unless I'm against Ryze or another AP champion, and to counter that switch to scaling armour) because against AD heavy champions you can sustain longer at the beginning and also makes it easier to farm and take ganks.

Glyph of Scaling Magic Resist:

• I love using these with Yorick, because unless you're against an AP champion (if so switch to static magic resist instead of scaling) at around level 10 you can pretty much take out the mid laner no problem.

Quintessence of Attack Damage:

• Just the same as the marks really, this gives you a great boost at the beginning and helps you to farm or dive for the kill.

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For Yorick I usually go for 9/0/21 because this lets me do slightly more damage, but also sustain long enough in the lane, and the Vampirism mastery is very important as this increases the amount you gain back from you Omen of Famine. Other notable options in these masteries are Culinary Master , Brute Force and Wanderer . Culinary Master gives a great little boost in the early game because, for example, if you're chasing someone down, you can proc a Biscuit and regenerate enough mana or health to help you dive the turret and use your W to finish him off. Brute Force gives you extra scaling attack damage that stacks with your runes so can help early to late game along with [Martial Mastery]]. Finally Wanderer gives you an extra 5% movement speed out of combat, which can help you to get to your mids aid quicker, even without boots, but it also helps if you're chasing an enemy down through the jungle as you can speed up and take them out.

The build for Yorick is always down to the opposing team and your own teammates, as this decides whether your build more armor or magic resist or both. The reason why it also depends on your teammates is that in my experience, every time I play as Yorick either the mid or bot lane feed, so you have to push your lane and build to make up for where your other lanes have lost.
I myself like using an AD Off Tank. The reason for this is that if a Yorick can't sustain in a team fight, then neither can his gouls, so unless you're going to carry and build full AD or AP and are sure that you can take down their team quickly, it's always better to deal a moderate amount of damage over time and stay in there for longer with your Omen of Death by your side (in case you die or to deal more damage) than to go in, do some quick heavy damage and then die.
Notable items that I use in almost every game are Manamune and Spirit Visage. The reason for this is because Manamune gives you a huge boost in mana, and also gives you attack damage based on 2% of your maximum mana. However, I suggest building this second and building Iceborn Gauntlet first, as it gives you the armor boost and slows enemies after you use an ability (works wonders with Omen of War), and by that time you will have already started to stack for Manamune. Spirit Visage is a must have for Yorick, even if you are against 4 AD's and 1 AP, because the passive works wonders with Omen of Famine and also makes you very tanky (I usually get this item before Warmog's).
Other things you could build are Randuin's Omen and Black Cleaver. Randuin's Omen gives you a huge tank boost and the active can help you to chase down enemies, or even run away. Black Cleaver gives you a good amount of armor penetration, but I would only ever use this against heavy armor champions.