It DOESN'T stack with the effects below.
8m/tick - Maelin's Methodical Mind
8m/tick - Reyfin's Random Musings
7m/tick - Aura of Taelosia
5m/tick - Koadic's Heightened Focus
5m/tick - Aura of Eternity
4m/tick - Adventurer's Aura
2m/tick - Soul Clasp
All other mana regen effects will stack.