Small Buff for Banshee's Veil
Reduce the cooldown timer from 40 to 30 secs. Because the fact that the timer resets every time you take damage makes it hard get it ready for team fight after it has been popped. (Any one whose smart will use their weakest/very spammable basic ability to pop it before unleashing a whopper of ultimate a so your chances of eating an enemy ultimate for your team as a tank is very slim).
does a very good job of soaking up team fight aggrieved but it more favors physical damage dealing tanks like
.
gives a good life saving passive against magic dmg. But again it is more focused on damage dealers.
We all know this is for sustains champs are people looking to build health sustain stats (regen,vamp,lifesteal) while cutting down magic damage.
The reason anyone buys Banshee's Veil is to counter bursts spell dealers in lane, mostly magic damage oriented ones like 

etc. But the spell shield works just as fine against ad bursters like
.
The main reason I prioritize
over
on my Toplane and Jungle Shen is because of how the cooldown works. I don't mind having to avoid damage to get it up, I do mind how long I have to though.
#I suggest reduce the cooldown on veil from 45 to 25-30 secs. That way if you can avoid enemy damage in lane for a while, you can get a spell shield every minion wave.