Can Rylai's build out of Crystalline Bracer so it's a little better on Battle Mages and ...
... has a lower combine cost?
It would only gain 50% or 75% base Health Regen and the combine cost would be reduced by 250 from 915 to 665. That would make it a better pick on Aurelion, Vladimir, Singed, and Rumble who are supposed to survive a bit longer in fights. It wouldn't really help Morde all that much, but it wouldn't hurt him either ...
Strangely enough, Taliyah and Katarina have more base Health Regen than those guys, so I guess they'd like it, too?

Edit: They both even share a blue crystal. Just imagine Rylai stuck the Bracer on a Blasting Wand because he she wanted to be a posh Gandalf and suddenly it started slowing people.
not 
and throwing 10% CDR on it with a minor cost increase would be good.