User blog comment:Willbachbakal/(Champion Rework) Zilean, the Chronokeeper/@comment-24385282-20160411212547/@comment-24385282-20160412022535

It doesn't say that the ability is put on its own cooldown again after the cast, maybe you could add that for ? Generally when you cast an ability it gets put on CD, but generally you also can't cast the ability while it's on cooldown in the first place. It's not easy to tell that his abilities will restart their cooldowns if cast while one CD.

Imo, having on such a low cooldown at max rank given that range and its effects already makes it at least a little OP, even if you can't permacast it on the same enemy to put them in an endless time loop. It doesn't really seem like it's only good in a certain situation; you can use it on enemies to send them back to where your teammates can just wait for them, knowing that they'll be guaranteed to just appear there in 3 seconds without them being able to do anything about it except stay out of range - 900 units. If you're being chased, you can just guarantee that the enemy can't kill you unless they do so in the next 3 seconds.

Of course he runs into trouble if there's more than a few chasers, but then he can just pop a behind him to not only  them by 50%, but also make any CC they use on him nearly impossible to have much of an effect given casting it will be a self- for twice the normal duration and if it utilizes a projectile it'll give Zil extra time to dodge or take forever to even catch up with him.

Maybe he'd be less of an unchaseable, inescapable nuisance in game than on paper, but with what I have to work with it really sounds like he'd be more difficult to catch than a and twice as hard to get away from.