User blog comment:Willbachbakal/(Champion Rework) Zilean, the Chronokeeper/@comment-1330314-20150211031631/@comment-1330314-20150510120343

I made sure the ultimate didn't interact with the new passive because it would make no sense to have it happen: the double-cast passive is there so that Zilean can lay down an extra amount of what he just used, and if he were able to double-cast his ult he'd a) have to double-cast it all the time in order to use it optimally, and b) likely have to receive increased cooldowns on either his ult or his passive just to account from that case. I also don't think his ult should benefit from Chronomancer because I think it's important that the resurrection time remain fixed (it would mess up the enemy team's ability timing, for example).