Item Concept - Staff of Endless Mana

When Clarity was removed as a summonerspell on Summoners Rift, there wasn't much outcry, especially since mana management isn't as big a problem for most people outside of tanks/fighters because of Blue Buff, Ocean Drake, and just large mana pool itemization on mages, sometimes though, it isn't quite enough, especially in LONG drawn out sieges.

Dota 2 has "Arcane boots" which allow a support to spend a bit of mana, to refill mana in an area around them.

I was thinking of something similar to that for League as a support item

BUILD: + +250 gold = 2100 Stats: 40 AP 45 Armor 400 Mana 10% CDR Unique: 15% movement speed out of combat.

Unique Active: Clarity - Infuse all allies in X radius with 80-700 Mana based on level of target to the target. (120 second cooldown)