Champion Rotation

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Olaf is top free champion to play in May Week 3

Lucian is top free champion to play in May Week 2

Corki is top free champion to play in May Week 1

Mastering Draven during free champion rotation

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Thresh is top free champion to play in April Week 2

Free champion rotation 7/12-7/18: Aurelion Sol and more

Free champion rotation 6/28-7/4: Ashe, Corki and more

Free Champion Rotation: March 1-7

http://na.leagueoflegends.com/en/news/champions-skins/free-rotation/new-free-champion-rotation-graves-lulu-orianna-and-more

Free Champion Rotation: June 1st