Cho + Rylai's might be OP in 5.13
I'm pretty sure its gonna be close to impossible to get away from Cho's Q if they have Rylai's. Just because of the passive from his E. Cho will just be able to AA, the enemy gets slowed, he uses Q, enemy champion has to either flash or somehow be really close to the corner of the Q to be able to escape it. Although I might be wrong and Rylai's doesn't proc of E passive.
Has always procced on Chogath's E. Or at least it did the last time I built it on him, which admittedly was a long time ago.