http://www.quietspeculation.com/2013/02/horde-magic-2-0-introducing-the-raid/

So per usual, some cards don’t just work without a brain telling them what to do, so we have to utilize some of the Horde Magic specific rules here.  For example, I wanted to use Masuleum Turnkey because it fits in with our criminal sub-theme, so remember that any creature you return goes directly into play (because the Horde deck plays things from their hand for free).

Also, don’t forget that when the Horde is asked to target something, they do so randomly (ala Disease Carriers and Ravenous Rats).

You’ll notice two new twists in this Horde decklist.

First are the poison counters.  You have to beat the Rat Horde deck before the entire city is doomed to disease.  Every time a poison counter is flipped, it adds to the poison total.  10 poison counters means game over.

Secondly, I’ve been experimenting with ways to buff Horde decks in different ways, and in this deck I am trying out using Sorin’s emblem.  The card plays like a token, so it triggers another flip and buffs the rats permanently.  From my experience, anthem-esque effects are great for Horde decks because they increase the difficulty over the course of the game to scale with the survivors being able to cast bigger and better spells.  This is especially important seeing as the rats are 1/1s versus other, bigger tokens.

While I am also including Bad Moon as a hedge, I want to stop using that card as a crutch to help scale up my black Horde decks, but I haven’t found a way that I am in love with yet.

This list comes with the normal caveats: your mileage might vary depending on which decks you choose to play with when battling the Rat Horde.  Some levers you can pull to make the deck harder or weaker are to add or remove discard spells or some bigger spells like an additional Plague Wind or Barter in Blood.