Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
How i play with Zilean:
Every time i go mid or top (2v1)
When u get advantage, kill all creeps with last mana and go buy first item:
When u got money foranddont wait and go buy (if possible and no one pushing). Remember, u have advantage with exp gain!
When i get banshee i go gank/help others. Thats it :)
This guide for support Zilean (not killer), good cooldown helps a lot :)
GL & HF
(My eng is bad, so its very small guide)