AP itemization suggestions: Banshee's Veil and QSS
was changed in the tank update around midseason 7, along with multiple other tank item changes and ADC itemization buffs.
:
500 Health -> 450 Health
50 MR -> 55 MR
The changes to Spirit Visage were to make it more specialized against Magic protection than the more general protection the higher health offered.
But at the same time, Banshee's Veil was removed as a tank item entirely
:
Cost: 2450 -> 3000
300 Health -> 0 Health
+100% health regen -> +0% health regen
70 MR -> 60 MR
0 AP -> 70 AP
The change seems very odd, since Banshee's Veil already existed as a tank option specifically against burst Magic damage, even more specialized than Spirit Visage turned into, but was changed into an entirely different class item.
Which brings me to 
. With a 90 second cooldown, this MR item cleanses crowd control effects while building into a later physical damage item.
builds into 
, which all have disparate effects separate from each other, but share the item in their build anyway.
If Guardian Angel can have a Stopwatch in its build path, why not add Quicksilver Sash to Banshee's Veil?
More to the point, I feel like Banshee's Veil should be split into two seperate items which both build from QSS.
A tank item, essentially what it was before the tank update, with the spell shield which blocks the first instance of damage to protect from burst, and a new item with its own passive shield.
Banshee's Veil
2700g ( + 
+200g)
70 Magic Resistance
300 Health
+150% Health Regen
+10% Cooldown Reduction
Unique Passive - Veil: Grants a Spell Shield that blocks the next enemy ability. This shield refreshes after no damage is taken from enemy champions for 30 seconds.
And the AP item
Quicksilver Orb
3000g ( + 
+ 
+635g)
+70 Ability Power
+55 Magic Resistance
+10% Cooldown Reduction
Unique Passive- Veil: Grants a Spell Shield that absorbs the next crowd control spell on your champion. 90 second cooldown.
I'm not sure what would need coded to keep them interacting with each other besides making the passive uniquely named, but the idea is to let mages have their cc protecting item while giving tanks back their anti-burst item.
and 
if they want high armor over more health, but there is no such option for magic resistance, with the best being the 55 from 