Path of Exile

You can run 3 60% auras off your mana pool, but after factoring in a maxed Reduced Mana gem (29% reduction) you need at least 22% in reduced mana reserved passives. They stack multiplicatively.

If you don't want to put too many passive points into reduced mana reserved passives, the unique helmet Alpha's Howl gives you 8% reduced mana reserved. It is probably a lot easier to run 2 60% auras and a 40% aura (Vitality or Purity of Elements). If you do that, you need 12% reduced mana reserved instead of 22.