Emberwake and the Taming

One of the "regular" Incinerate setups:

Incinerate + Spell Echo (130%) + Faster Casting (120%) + Fire Penetration (140%) + Iron Will (100%) + Empower/Life Leech (125%/130%).

That comes out to ~24 mana cost per cast, and each cast gives one free cast.

Now with the Emberwake/Taming setup:

Incinerate + Spell Echo (130%) + Faster Casting (120%) + Chance to Ignite (110%) + Life Leech (130%) + Empower/Fire Penetration (125%/140%).

That comes out to 25 mana cost per cast with Empower, or 28 with Fire Pen.

But in the case that you rely on EmberTaming to get your damage, you can dedicate your passives to life/ES and mana/mana regen. This means the mana cost is not only rendered negligible, you can actually use MoM for life builds.