So, this build is all about early game mid control. When i play this, i usually have 2-3 kills mid by 10 mins, because alot of people don't understand how quickly Zilean can burst them down, til it is too late. Open up with a few early Q's to get em half health.. then around level 4, when you have Lv2 Q, Lv1 W, Q them, pop W and Q them again, then ignite, and they are for sure dead. This is where the reign starts. Once you drop your mid champ, you can roam around for a bit, and usually pick up 2 more kills before 10 mins.. putting you with an early RoA. This gives you control. Now you can play aggressively, and poke with your Q then burst when needed.