Ahri is a great champion for climbing in low, and even mid to high Elo. She has a great early game and is strongest during the mid game. Make sure to combo your Flash + E to take people off guard. Ahri is a extremely safe champion and even in her worst matchups she can play very safe due to her R. Abuse Ability haste and AP items, and always itemize against the enemy team, building Zhonyas against AD, Banshees against AP, and Morello against healing.