I made a tool that allows you to find the mathematically correct build for any champion (also includes a Practice Tool simulation where you can attack any champ instead of a dummy) :
My personal Kassadin matchup tier list (some top lane champions included because of laneswaps). Tell me what you think! : r/KassadinMains
THE *ULTIMATE* YASUO MATCHUP TIER LIST! - League of Legends - YouTube
What is the hardest matchup in League? - Quora
How to Play into a Bad Matchup in League of Legends - Mobalytics
LoL Champion Guide: Sett, the Boss | EarlyGame
LoL Tier List - Best Champions in Solo Queue - Patch 12.22 - SenpAI.GG
How to Learn a Matchup in League of Legends - Mobalytics
Champ Select Coach
The most picked champions in LCS, LEC, LCK, and LPL are surprisingly different | ONE Esports
JUNGLE champion matchups of top 1000 NA players and top 2500 EUW players : r/leagueoflegends
Teemo Top LoL Matchup Guide: Complete Laning Strategy, Tips, Counters & Item Builds - League of Legends - DAYDULL
The Top Lane Tier List of Patch 12.21 | RiftFeed
2019 Spring Professional LoL Champion Matchup (Win rate) - Mid | heatmap made by Kuanweichen | plotly
KatEvolved on Twitter: "KatEvolved's S11 Katarina matchup tierlist https://t.co/O5HfBFMAXq" / Twitter
Urpog, CEO of Offmeta Urgot on Twitter: "(UPDATED) All roles masters Urgot POV matchup guide up to date, the other one I posted was missing like 20 champions so here's it reposted. #
Lane Bullies: Winning Top In A "Bad" Matchup - Esports Edition
The Mid Lane Tier List for Patch 12.21 | RiftFeed
While procrastinating I made MY tier list of champs matchups : r/IreliaMains
Irelia mid matchups tier list IMO. Based on higher elo where people know how to play there champs would look very different in lower elo, thoughts? : r/IreliaMains
How to Learn a Matchup in League of Legends - Mobalytics
How to Play into a Bad Matchup in League of Legends - Mobalytics