There are 40 champions in free champion rotation this week : r/leagueoflegends
LoL Free Champion Rotation Time (6th-13th July)
The Man With A Million Blue Essence - (FREE CHAMPION ROTATION ARTICLES WILL BE DISCONTINUED STARTING TODAY. CHECK OUT "SOURCES" AT THE END OF THIS POST FOR THE LINK) . ARAM FREE
LoL Free Rotation Guide - LOL Fanatics
League of Legends Weekly Free Champion Rotation
LoL: Free Champion Rotation This Week | EarlyGame
League of Legends Free Champion Rotation (Patch 12.22) - Mobalytics
League of Legends Free Champions Rotation This Week (November 29) | GINX Esports TV
Free character rotation & schedule - MultiVersus | Shacknews