Title pretty much says it all. I'm mean Zeke's gives the support 50% crit and increase in AP as well as the adc. Whats the fear in letting a Janna or a Karma get some attack speed for shielding herself.?
Then it starts being used by Kayle or Teemo in other lanes. Which is the only problem I can see it about it.
Ardent Censur's problem is it's a mediocre item with no scaling. Even Zeke's Herald did more for your team unless you were 
with 
roaring your minions to attack the tower faster before they added a small damage steroid but removed it's effect on minions.
If the attack speed bonus scaled (Maybe up to 70% at level 18?) And the magic damage also scaled (maybe like a .2 AP Ratio) It would be worth keeping but as is it's not even worth the buy when there are better items
A few of those could be problematic if they could self-proc Ardent.
i think itd be good if it was just the attack speed. some support benefit a lot from as. bard, taric (passive), karma, alistar (ult/autos). if janna needs to secure kill on someone that is low she can shield herself auto them. bonus AS helps in these circumstances. helps with karma passive. helps sona get her power cord out more smoothly etc.
You're going to bring AS 
BACK, and it's going to be AWFUL.
Censer is strong enough if the jungler is smart enough to build Sated over Warrior.
It would become a must buy item on Sona, I think.
make room for your end 
why not make it more sensor like 
I think the only thing keeping this thing in crap tier is because of Sona being able to proc the item on her entire team, minus herself.
