Arcane Brilliance

Arcane Brilliance is a very long-lasting mana and spell power buff that affects an entire party or raid at once.

Tips and tactics
Mana buffs are only useful to players that use mana (all but death knights, hunters, rogues and warriors), and the spell power buff is particularly useful for healing and spell DPS specs. Keeping Arcane Brilliance on all the party's mana users is recommended.