User blog comment:Emptylord/Season 3 - PBE Patch Notes/@comment-5045559-20121121040128/@comment-5490997-20121121090642

Well the mana regen aura is on Kage's Last Breath now, but yeah I'll miss it because Kage's doesn't fit on a tank in any possible way + we lost AoE CDR. I finally started to appreciate it recently for mana hungry tanks that need more than a philo to get through the jungle effectively (mainly Maokai). On some supports it wasn't bad either if you were teamed up with a mana hungry poke AD (or someone who was just bad at managing their mana...).

I won't say I build it on all my champs or even in every game, but I do think it's a loss. At least I don't feel Kage's is a good replacement for it.