[Psitticine]

One thing I've found helpful with Mictlan is to make good use of their cheapest priests, the ones just called Mictlan Priests. Equip them with Jade Knives and Sanguine Dowsing Rods and let them spread the Dominion as well as rounding up the Blood Slaves. The more expensive guys have better work to do!

Oh, and summons are very important to Mictlan, IMO, and not only blood summons. Anything you can conjure up will be a help.