Wouldn't building
be better tho? Both give CDR, and either one offers mana regen and MR. Might as well add MP with abyssal, may not exactly be MP but MR reduction.
The problem I'm seeing is you're using a pointless passive that's not too useful on the champ, just for the stats when you can build a combination of items that give the stats, and have long term affect passives. Unless I'm missing something with the healing mechanics as the description is pretty odd.
The only upside to athenes I can see, is it offers the stats with an easier build path early in one item slot rather than two, but then you move to late game where the stats are less relavent and you have an item with almost no passive.
Speaking of mana pool, I wonder how well
would work on him now with it's price reduction.