Updated Every Friday
Items
Carousel Item Priority
Higher Priority Items
Lower Priority Items
High>>>Low

Item Quadrant
Strength (y-axis) is based on how effective an item is in the situations where it is most used. Items that are strong at all stages of the game are listed higher.
Versatility (x-axis) is based on both the number of Compositions an item fits in and Champions an item is used on. Versatility is also how often you could build an item.

Rageblade got a lot better in 10.3.
Rageblade got pretty good for Rangers this patch especially since Infinity Edge got nerfed. Works great with Statikk Shiv.
Compositions
Tiers are determined by what I think will get you the highest average rank. This means that while one composition might be super strong late game, it may be difficult to acquire, so it may not be S-Tier. For example, it is difficult to win with Berserkers, but extremely easy to Top 4, which makes them S-Tier. Rankings within a tier are very close together. Always try to play with what makes sense for every game, and adapt to your lobbies with proper tech choices.
Difficulty, Item Dependency, and Variance are listed. Difficulty is how hard the composition is to play. Difficulty does not factor into the strength or viability of the composition but serves as a factor for new players. Item dependency is how important specific items are to the composition. Variance is the approximate placement range of the composition. For example, a consistent Top 4 composition has low variance. A composition that either places 1st or 8th has a high variance. If I mention that a composition is Forcible, it means that you can play this comp every game.
Tier placement assumes strong play.
S-Tier: Highly Flexible or Very Strong
Ranger Warden
Difficulty: Medium
Item Dependency: High
Variance: High

Inferno Shadow or 6 Inferno – FORCIBLE
Difficulty: High
Item Dependency: Low
Variance: Low

Can add Summoners earlier as well via Yorick/Malzahar. Highly Flexible. Kindred 3* is preferred. This composition is really difficult to get 1st place with if you keep Kindred as your carry, but 3rd and 2nd is quite manageable.
Sion likes mana for CC. Lockets are very good for early game in this composition since you do not have front line apart from Sion and Amumu.
A-Tier: Solid Team Comps. Weaker, less flexible, requires more luck than S-Tier. Any Lux 2* Comp is at least A-Tier
Summoner Assassins
Difficulty: High
Item Dependency: High
Variance: Medium

Ocean Mages with Wardens
Difficulty: High
Item Dependency: Low
Variance: Low

Hyper Roll Predators
Difficulty: Low
Item Dependency: High
Variance: High

B-Tier: Playable, but not Preferred. Comps could also be untested.
Blademaster Mystic
Difficulty: Medium
Item Dependency: High
Variance: Medium

Berserker Poison Desert – FORCIBLE
Difficulty: Low
Item Dependency: Medium
Variance: Low

C-Tier: These are compositions that are weak, but if they are given to you, you might be forced to play them.
Lights – Difficulty: Medium. Item Dependency: High.

No need for hyper roll. Just get GA on Yorick + 2 random items. I like hat or defensive items. Make sure Vayne has at least 1 item, preferably Rageblade. You can transition to Lucian if you get Lucian items.
Husband and Wife – 6 Light + Senna – Difficulty: Low. Item Dependency: High.

Hyper Roll Lights – Difficulty: Low. Item Dependency: High.

6 Assassin 4 Desert – Difficulty: Low. Item Dependency: High.

Meta is cool
Thanks for the YT Vid and these builds. Climbed from S4-G4 sampling stuff out, but mostly with the Berserker build. TY!
Nice job keeman! Berserkers are a little weaker this patch, but definitely playable if you get an early Olaf!