Top lane been a great line this year so far, with the release of Sett and the rework of Volibear, this line just keeps getting harder. However a lot of champions been abusing their power on the top lane, we have support champs like Soraka, Sona (this one getting nerfed) using their poke abilities in the top lane, ADCs like Lucian and Kalista destroying tanks, jungles like Kayn, Hecarim and the reworked Fiddlesticks. And then we have the mages on top lane, Syndra and Cassiopeia been doing good in the top lane this year, however i feel like more mages could take advantage of their poke ability and be top laners, Orianna is one of those champs in my opinion.

Orianna's poke game is really strong and i feel like as a top laner she can have an advantage against other top laners cuz of how fast she can be.

Pros

+Amazing teamfight character
+Incredible Late game
+Game changing R
+Responds amazing to ally ganks
+Bully laner


Cons

-Squishy
-Enemy ganks could be a problem
-Can fall behind easily if she lets the top laner kill her twice
-Depends a lot of her ball

This phase kind of easy if u play it right, try to freeze your lane for an early game gank, try to poke as mucha as u can and try to have a perfect warding to avoid an enemy jungler gank, on first back u should have enough money to buy the Lost Chapter, if not just buy a Control Ward, a Sapphire Crystal and an Amplifying Tome.

First needs to be between Luden's Tempest, Everfrost and Archangel's Staff.

Buy Luden's Tempest if u want to:poke harder and have more damage.
Buy Everfrost if u want to: have a cheaper option for first item and have more slow, also a great item for tf.
Buy Archangel's Staff if u want to: not deal with any mana problem and wanna have a great defensive item as soon as it transform into the Seraph's Embrace

All three items are viable and are ok as a first item. After buying your first item u should rush them boots, tbh u can go with any boot it just depend of whats going on on the game. Before early game is over u should try to break as much plaques that u can even destroy the enemy's torret. u can secure the Rift Herald with the smite Smite that u can use eventually with the Unsealed Spellbook.

In mid game u should try to destroy every turret in the top lane and try to roam to the bot lane. Orianna could win easily any trade if she roams to bot lane, try to secure the drake, use your smite if u didnt before.

Second has to be Morellonomicon, it gives u health + magic penetration, however third item could be any of the situational ones.

Buy Zhonya's Hourglass if u want to: have armor, AP, and an "second opportunity", works amazing against assassins.

Buy Iceborn Gauntlet if u want to: have a defensive item that gives u armor, mana and physical damage.

Buy Randuin's Omen if u want to: protect yourself of any fed adc.

Buy Spirit Visage if u want to: protect yourself of any fed mage.

Buy Liandry's Torment if u want to: poke even harder + more health.


After buying your third item u need to get ready for the gametime: late game, try to help your allies so they can be fed for this phase.

At this point of the game u are one of the strongest champs in both teams, even if u aint and u lost your line, u can still contribute to teamfights with your R and with your shield, thats why i recommend items like Redemption, Shurelya's Battlesong, Knight's Vow and the Athene's Unholy Grail as 4th/5th items just in case u fall behind so u can contribute your team with shielding and healing, plus all of these items really cheap. u can also buy Lich Bane for more movement, Rod of Ages for more life, mana and AP (try to comb this with the tanky items]] unless you want to go for the Abyssal Mask (basically a tankier version of the RoA) , Banshee's Veil for stuns, Nashor's Tooth for a more attack speed that can help u with your pasive, Twin Shadows for more slowing and map control, i would recommend Wit's End for more attack speed + MR + its passive that gives you magic damage on your autos, and finally Rylai's Crystal Scepter for more slowing. Just try to see your surrounding so u can have an idea of what u buying.


Once u full build i can safely say that u can win any tf if its done right, try to play behind and not expose yourself so u can be helpful in the tf.