How to deal with Ahri

Step 1. Pick Veigar Step 2. Get 1500 AP and Lichbane Step 3. Push R and auto attack her. If she isn't dead you fucked up so push ignite Q and auto her again, it shouldn't matter if the Q hits, just like Ahri's Q for the MS buff, we only need to lichbane her.

Step 4. This is the most important. Be sure you let her know how much of a weeaboo scrub champion Ahri is in all chat.

Follow the above steps and you will get Challenger for sure because Ahri is in 12 out of 10 games.