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Pawn of Ulamog 4
Perilous Myr 4
Myr Retriever 4
Infectious Host 4
Pierce Strider 2
Bubbling Muck 2
Kaervek's Spite 4
Sign in Blood 4
Heartless Summoning 2
Pox 3
Smallpox 3
Dark Ritual 4
Hymn to Tourach 2

City of Traitors 4
Ebon Stronghold 4
Crystal Vein 4
Swamp 6


Well the idea is make everything worth sacrificing, accelerate with heartless summoning, sol lands, bubbling muck, and dark rit. Keep the hands low and whatnot. I think pawn of ulamog could get more use, a quick and lazy gatherer search brought me pierce strider to be returned by the retriever and then cast with spawn tokens.  I'm sure there are better choices for some of the cards but I think this could work with a little testing and tweeking.

You're trying to do two very different things, and doing neither well. You either want a prison deck, or a burn deck. You need a deck that works cohesively to one gameplan, and everything in it should furthur that gameplan. Heartless Summoning + Perilous Myr is bad. You're basically throwing Shocks at sorcery speed. Infectious Host is even worse.

With the Pox gameplan, you'll not want to bother with creatures unless they recur themselves or generate card advantage. 

Ancient Tomb/City of Traitors are terrible with Pox, and generally you can't use the extra colorless mana; you need strong black sources in a deck like this. They are for a different style of deck entirely.

With a heartless Summoning out, you're likely never to have 3 creatures for Dread Return, since only 9 of your dudes in the entire deck survive it (3 of which you can't cast) Even if you did have them, there are FAR better targets than Sun Titan. 

Almost everything in your deck is counterproductive to the rest of the deck. You really need to start with a better gameplan, and work it out from there. 

It looks like a harsh analysis, but really, there was so much wrong with this deck, I hardly knew where to begin.

I've just gotta say. You're very gracious with your learning, and you're really determined to make things work. Good qualities. You've got potential to make some really good decks; you've just gotta fine tune your eye for what works, and what doesn't.