What if Manamune received the Archangel's Staff treatment?
Give it 20% cooldown reduction, or 10% if 20% proves to be too powerful.
I say that because one of the reasons why many potential users of Manamune do not take it at all is also the reason why many potential users of Archangel's Staff didn't used it: you take too much time to stack it if you don't have any cooldown reduction, so you are left with an item that delays your early game powerspike and gives you few offensive benefits compared to old Morellonomicon. And even if late game it technically gives you "more" power, again, you are lacking in cooldown reduction, so your spells are stronger, but you have less rotation opportunities (unless you compensate it with other items in your build, but you are probably still sacrificing other potential items). With Archangel's Staff having cooldown reduction, you can stack it faster, and even if it gives less early game power than other possible mana options (Ludens and GLP) the late game power more than compensates for that. This significantly increases the viability of Archangel's Staff on champions that are not named Ryze or Cassiopeia. Examples include Malzahar, Veigar, and Xerath.
Many potential users of Manamune/Muramana suffer from the same problem. They could use them, but this item takes too long to stack, that and the lack of other useful offensive stats like cooldown reduction or lethality means that all potential users of this item don't build them because you sacrifice too much by going for that build path. The only exception is Ezreal, because he doesn't actually have a better build path (that's one of the reasons why jungle Ez got popular in the past, he didn't had to build Tear)
If Manamune had cooldown reduction, more potential users could build it. An example is Jayce. He takes too long to stack a Tear, so he is better off building lethality for a better early spike and just being conservative with his mana pool. With Manamune having CDR, this could no longer be the case. Going directly for lethality would still be a better early game build path, but Jayce would now have another option he could consider if he wanted to have a better late game. Other potential users: Lucian (he can double proc Muramana with his passive), Kha'Zix (he can proc Muramana twice with a single auto if empowered by his passive), Varus (tear/lethality Varus mid could be a viable choice once again)
Of course Ezreal would have to be looked at, as this would be a big buff for him, but I think that we shouldn't stop making potentially healthy changes to the game just because one champ can abuse them.
An idea would be to change the 
in Muramana's build path to a 
- this would also make the build path way smoothier, giving champions even more of a reason to build Muramana.
and 
got reworked and no longer want this item cause it gives no health and less damage. Cdr will not realy add something they want. Old Yorick had similar to Jayce tear for high manacosts. Old Urgot could proc on his q muramana similar to Ezreal on his q. New Urgot procs it with each w stack but that draisn his mana realy fast and so it is bad.
? Alternatives would be 
and 
. Ad Junglers even have 
.
You know the times Jayce wants Muramana and the times he don't want it? If either the Manarunes are to strong or to weak and if fights last to long or to short. In pokemetas or with weaker manarunes Jayce sure tends far more to build tear.
Muramana is jsut not attractive cause mana isn't that big of a deal with Manarunes and most ad champs want ad, lethalaty, health, armor or mr.
champions is that they actualy got most times old Morellos as third item. All patch 8.4 did was that they get their 20%cdr 2 items earlier. But Ezreal till now gets most times just 
or 
plus 
. Maybe Transcendence was in his runes or ofcpurse if he needed a maw he would get one. But adding jsut 20%cdr would make him suuuuper strong. Like he would either just choose other Boots like 
or 
or get even more ad with ionias and transcendence.
. Or give Ezreal a good rework adn either replace uramana or just remove it.
and 
players ideas...
extremely well, and actually rivaled (fr)atmogs or surpassed it for several fighters and bruisers. (Think 
)
