There are 40 champions in free champion rotation this week : r/leagueoflegends
Free Champion Rotation: June 8th
LoL Free Champion Rotation Time (6th-13th July)
Free Champion Rotation : r/leagueoflegends
Surrender at 20: New Free Champion Rotation Season 3 Week 15
League of Legends free champion rotation (September 27): What are the free champions this week - Dexerto
MOBAFire on Twitter: "The time of the Darkin has come. Check out this week's free champion rotation! https://t.co/UMSVSu2kjs https://t.co/tyWoWlOiAV" / Twitter
See @LeagueOfLegends's Tweet on Oct 6, 2014 on Twitter / Twitter