User blog comment:Willbachbakal/(Champion Rework) Zilean, the Chronokeeper/@comment-1330314-20140215174141

I went over this again and decided to completely change Zilean's W. I completely removed Rewind and redid it into his passive, but my previous W was a stationary buff area. I changed it into a chargeable time bubble that damages and stuns enemies in its wake -- much more in line with a time mage. He also has pretty good damage output now.

I also redid Time Warp: my previous version tacked on magic damage to its slow, which I now removed. Instead, the duration of the slow/haste scales with AP, as is now the norm for champions designed as supports. It could also solve the problem with live Zilean's weird power scaling on his E: it's crippling at low levels, and at high levels its cooldown is too high without the use of Rewind. Here, I mage its cooldown decrease by a huge amount with rank and made the slow scale in power with rank as well. The duration scaling with AP means it will still be really strong at high levels, just with a much smoother progression.

A more minor change is reducing the duration of Chronolock's protective rune from 7 seconds to 3. It's meant to be a clutch save, not a guaranteed save over the course of a whole teamfight.