To make a zombie mill deck, take out
* Ghoulraiser (3)
* Ghoulcaller's Chant (2)
* Distress (1)
* Swamp (1)

and put in
* Undead Alchemist (4)
* Trepanation Blade (2)
* Nephalia Drownyard (1)

** TODO **
Pyschic Vortex vs Mind Unbound
* Vortex is cheaper and I can choose to get rid of it. Sacrificing a land is potentially not a big deal if I'm comboing with Rooftop Storm. Comes down to how I feel about sacrificing land and having to discard my entire hand every turn.

Words of Wind & Words of Waste
Nice combo with Mind Unbound or Psychic Vortex to make my opponent discard or make all player's return permanents to their owner's hand.

** Standard Block Possibilities **
* Bone Splinters - Cheap creature removal. Essentially two black if I sacrifice a Gravecrawler and bring it back.
* Call to the Kindred - Basically gives me free zombies. The chances of me getting a Zombie in the five cards is very high.
* Endless Ranks of the Dead - Necessary. Will replace Army of the Damned. Army is too expensive. I've never actually cast it and without Dark Ritual or a Crypt, it will be even harder.
* Curiosity - Card advantage
* Fuel For the Cause - Interesting counter spell that would give me more +1/+1 counters.
* Geralf's Mindcrusher - I don't think this is worth it, but it's interesting. Big creature, plus 5 card mill. I think that my creatures are beefy enough though with all the +1/+1 counters going around.
* Ghostform - Make two creatures unblockable? Yes please
* Visions of Beyond - Chances are high that a graveyard will have 20 or more cards if I start milling.
* Inexorable Tide - Oh my. Proliferate my counters every time I cast a spell? Potentially awesome
* Secrets of the Dead - A free card every time I cast Gravecrawler from my Graveyard. This seems like a winner.
* Havenful Lich - Combos with Secrets of the Dead for more casting from Graveyard
* Geth, Lord of the Vault - Expensive, but lets me pull creatures from opponents graveyard while milling them.
* Gravepurge - Let's me put any number of creatures from my graveyard on top of my library. Hurts the Unbreathing Horde, but could be worth it.
* Harvester of Souls - Another combo with Gravecrawler. I draw a card whenever a non-token creature dies. And the draw is optional.