A snapshot from each season to compare champs that had highest WR, ban rate and popularity and also the general state of the game [Average Duration, Blue vs Red WR, etc.]. :
Valorant patch notes – latest balance changes and updates
Winners and Losers in League of Legends Patch 7.10
NEW TIER LIST (Patch 13.17) - BEST META Champions to MAIN - LoL Update Guide - YouTube
Valorant 7.10 Update Patch Notes, and Latest Updates - News
LEE SIN & GRAVES NERFS? NEW OP CHAMPS IN 7.10 - Champs to watch / Nerfs / Buffs - YouTube
League of Legends patch 7.10: Pulsefire Caitlyn plus Heimerdinger and Rammus reworks