I updated this concept, this is the older version
Item price: 2900
+70 AP +20 ARMOR
UNIQUE: Autoattacking an enemy champion 3 times increases your armor by 20 and your AS by 80% for the next 5 seconds (10 second cooldown)
Very niche item but this could balance out champions like azir and diana without direct buffs & may even be used by champs with AA procs like Ekko who can benifit from the bonus armor.
What would this build out of? Will the build path lead to an absurd combine cost, considering the items that might lead up to those stats are needless and cloth armor? Consider the penalty for having an item that does very little for your character until it's complete, if you didn't plan on adding a sub-item. Do you think it's even a good item on those characters, considering how Diana's whole kit is entirely front-loaded burst? Would she even survive long enough to proc it if she needed to DPS? Why do you think that combination of stats makes sense? Etc. might want to give a lil bit more details here.
This would be usefull, if if it just gave crit reduction and jaut 70 or 65 attack speed
Abusers 
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, AP 
[zombie-brand-mindblown]
