ok, so from the looks of it, morellonomicon 
is an item for ability spamming mages, like 
or 
,
i mean it gives 20% cdr, Maximum mana, Mana regen, seems legit right? but one stat that doesn't make sense is the 100 AP, it's a spam mage item, not a burst mage item, but 100 AP is the most AP you can get from a single Item, Excluding Mejai's 
and rabadon's 
. so why 100 AP? why not 80 AP? or maybe even 75 AP? can anybody answer this?
it used to be 80 AP but after the amge reworks they changed it because they completely changed some mage items and mana regen itself. A lot of items that gave passive mana regen no longer give said passive mana regen (aka mana regen per 5)
I think they buffed it up to 100AP due to that fact and also because a few other AP items got reduced in AP, like zhonyas and ludens (ludens used to be 120 AP i believe)
However I do agree that morellonomicon IS pretty jacked up in overall stats for just ONE item, especially since a lot of people use that as their first item considering it's very useful early for ability spamming from the cdr and mana it gives. I agree that it can use a slight cutback.
It used to be like 70 or 80 or something like that. Riot increased it to 100 the same time they changed athenes unholy grail.
Maybe to make it easier for mages to play in this meta. Like a balancing act so Riot doesn't have to make the champs itself stronger?
doesnt really care because i play 
and i just need that mana for constant poke
