this is my way of playing yorick it makes him hard to kill and makes your dammage output amazing, and pushing nexus smooth, enjoy.

sheen: goes very well with his "Q" skill making him scary to the opposing team early game.

berzerkers greaves: for attack spped and movement, i dont suggest any other boots he does need this attack speed a lot.

frozen mallet: gives him health for his skills and makes him even harder to kill also adding dammage.

trinity force: makes him much faster able to catch his targets guicker and having the passive of phage to slow them, after buying frozen mallet makes for even more slowing.

the black cleaver: gives him dammage and the attack speed makes him much more dangerous (you may also consider blood thirster instead of this but the speed helps a lot).

warmogs armor: makes him extremly hard to kill and makes skills/summons a lot more tanky.

atams impaler: this is an item that will make him madly strong with all of the health he has from the other health items.

i like to max his "Q" first and get sheen first to that he is hitting very hard early game. keeping his "W" and his "E" works very well aswell. and obviously 6, 11, 16 for ultimate. when you max his "Q" first combined with the sheen the dammage you hit is increadible. when you up "W" and "E" it keeps everything nice and even, it is not best to get one or the other up, if you get "W" all the way up you will not have as much dammage on your "E", if you get "W" all the way up you cannot slow them as much and may lose a kill or get chased down and die, stay even.

ignite: always good to finish them off i dont suggest to getting the mastery for this cause he doesnt have ability power.

exhaust: is for early game more ensuring you get fed and making late game very easy.

heal:when having all summons out and ulting you can heal when they are low and keep them out for longer making you very dangerous.

flash: many like to use to get away but i may use as to land "Q", "W", "E" in that order for those who are very defensive, ghost may be good for chasing down and landing your "Q" on them making you faster of course while laying down "W" while chasing slowing them

revive: no you really do not need to be revived really soon, late game if you are losing you wont turn the game around, and early game you would just be wasting 3-15 seconds really

teleport: i guess it would help you with a teemo on ur team to teleport to shrooms or just wards or making time across the map but not as helpful

cleanse: maybe if you are running away also with ghost but you really dont want to use your summoner spells for running his normal skills can do that just fine

smite: if you even considered getting this go look at a jungler guide

rally: no it really isnt a helpful spell at all, i guess if all summons were out and you had high hp already it would be alright but thats late game and it will just be destroyed by aoe abilities

clairvoyance: i am not a fan of this spell and your "W" can be used to see near by bushes but if you needed it for other purposes it is out weighed by other spells that are more useful

clarity: he does have low mana and this would help much for him maybe get it if you really cant handle saving your mana

fortify: no personaly i have never used this spell i find it not helpful at all, if this was a complete tank build i may consider but with yorick no

PROS:

tanky
strong
great in team fights
stopping minions waves
farming
1v1
pushing
escaping


CONS:

slow early game occasionally
slow speed until trinity force
hard to land full combo every time
very low mana
not extremely powerful but still good

when in a lane and partner engages try to use your "E" when you start to get low so you are targeted, if team mate gets low then use "W" so that they are slowed, when with a dps like tryndamere or master yi ult on them when you are in a team fight, hitting the tower making it come down very fast, and deception. If with shaco or mordekaiser or both you become a very deadly trio/duo, when shaco ults you ult on him NOT HIS CLONE, the team fight could be considered 4v2 while laning, with mordekaiser after he takes a life with his ult you ult on yourself or him depending on dammage and attack speed to take down towers menacingly fast.

his ultimate when the person targeted with it dies it acts as a guardian angel but when you are revived only for a maximum of 10 seconds, very fun with karthus, kogmaw, zilean ult, anivia, and anyone with guardian angels, his "W" reveals spots that you release it at, when the games starts you may chose to buy it as your first skill and send into bushes to check, but later games for checking baron and just suspicious bushes, can also send down in forest for teemo shrooms and stopping rammuss "Q" coming toward you or team mate, also block projectiles like lee sin "Q" and nidalees "Q" even making a caitlyn very angry blocking her ultimate (many things to block), if you are trying to run from others use "Q" on a minion, or a champion if desparate combined with "W" for a speedy getaway along with hitting "E" on a minion to ragain health as you run away!

when farming i like to use "Q" to bring them from 2/3 hp to 0/3, when low health a very good to regain your health is to use "E", try not to use "W" or "E" too much for you will lose much of your mana and may lose a team fight or just miss a kill which is very helpful in early game.