This is my usual Zilean build. I know the items and runes are somewhat unusual but this build carried me a far way and it works just fine for me. Items are
Zilean Mid vs Vladimir - EUW Challenger Patch 12.2 - YouTube
Zilean Pro Builds, Guides, Stats, Runes, Items
LoL : Ce build Zilean AD est le roi du One for All ! - Millenium
Zilean Build Guide : Zilean Mid Diamond-Master :: League of Legends Strategy Builds
HOW TO PLAY ZILEAN MID | Rank 1 Masters Zilean Guide | Season 11 | League of Legends - YouTube
So uh, just started trying to learn Zilean, I think I'm a big fan lol : r/ZileanMains