League of Legends Cassiopeia Mid Season 6

Hey guys. Sorry it's been awhile. This one's blind pick Cassiopeia. It had been a few months so forgive my mechanic mistakes. Please comment, like, and subscribe.
Runes: 5% CDR, 23 ap @ level 18, 9 armor, 4 magic resist.
Masteries: 12/18/0; Taking thunderlords and oppressor.