Mana bar shows innervate / similar clearcasting overlay.
Current version also has Pantheon trinket and remaining rejuv casts before depleting the shield stacks. Pretty simple and straightforward.
Link to innervate bar that I based this on: https://www.weakauras.online/en/a/8mV9NVM9zk
What is custom code?
WeakAura Custom Code
Current version: 1.0.0