Simple reminder to use a mana Potion at a deficit of 3000 mana or more to assist in getting the maximum mana return as well as making best use of the CD timer. This will auto display based on the instance you're currently in and the Mana potions you are using in the order of Nethergon/Cenarion Salve in TK/SSC, Then Mana Injectors, then finally Super Mana Potions. Additional potion types can easily be added by duplicating the Super Mana Potion Aura.
Aura will only appear if;
You are in a boss encounter in a raid environment
Your potion timer is off CD
Your mana deficit is >= 3000
This aura is also future proof in that it will continue to work on all boss encounters in upcoming phases of TBC Classic.