You may want to consider having only one Mirror Mad and adding in the black so you can have some Diabolical Tutors (so you don't have to reveal the card and show everyone what you are up to) and Spider Spawning (the flashback is black). Since the Mirror Mad lets you mill until you hit another Mirror Mad, having only one should allow you to draw twice as many cards when it first hits (assuming equal distribution, etc, etc). Also, you may want to add in a Doubling Season or two since the Cagebreaker is one of your win conditions.
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Ripping out the Endless Ranks was a good idea, but you have to put in 4 Unbreathing Hordes. The damage prevention makes it burn resistant (or burn proof if you combo it with something that give it at least +0/+1) and it makes a huge difference late in the game. I'd pull the 4 Wring Flesh, 3 Doom Blades, 1 Geth's Verdict and push the 2 Distress, 4 Geth's Verdicts to the sideboard and add 4 Unbreathing Hordes, 4 Gravediggers, 4 Diregraf Ghouls, 2 Ghoulcallers Chant. The Diregraph Ghouls will help to lower your mana curve and give you a blocker in the early stages (so you can save some of those burn spells for later) and in the late stages it's another zombie for the swarm, but since it's a not a token and 1 CMC you can keep bringing it back. You should add the Gravediggers for two reasons: 1) You can have two zombies on the field for 1-2 mana less then Moan of the Unhallowed's flashback cost (and it's combo that you can repeat over and over. Gravedigger + Diregraph Ghoul) 2) You can use it bring back a burn magnet...I mean Grave Titan and save the Ghoulcaller's for bouncing Zombies As far as the Unbreathing Horde goes, giving you opponent the choice to block a Grave Titan, a 8/8 Unbreathing Horde, or 5 random 2/2 Zombie tokens = GG