Deathbringer Thoctar partnered with Primal Vigor in a sac deck is fantastic.

Blood Artist?!?!

Prossh is the best. Prossh EDH Tokens/Sac is my deck. There are a ton of cards i recommend, so I am just going to list them out.

Avenger of Zendikar, Craterhoof Behemoth, Mycoloth, Blood Artist, Grave Pact, Doubling Season, Parallel Lives, Beastmaster Ascension, Attrition, Xenagos, the Reveler, Xenagos, God of Revels, Garruk Wildspeaker, Descent of Dragons,

also you need WAY more ramp then what you currently have. Farseek, Nature's Lore, Skyshroud Claim, Explosive Vegetation, Cultivate, etc are all good ideas.

Next step is upgrade your land base. Id start with shocks and a couple fetches Blood Crypt, Stomping grounds, Overgrown Tomb, Wooded Foothills, Bloodstained Mire etc. most of the ramp spells above can get shocks, so id get those first.

Good luck! there is all kinds of good stuff in there, I'm currently waiting on my Craterhoof Behemoth and a chunk of ramp to come, then I'm saving for a demonic tutor. Id also appreciate any suggestions you may have. Thanks!

I like it, but just a word of advice you should do all you can to avoid using slow lands either spend the extra money to get the good ones or just run as many basics as you can as with prossh you want to be as fast as possible. Looking at your creatures I did notice you where missing some of the best token generators such as Dragon Broodmother, Dragonlair Spider, and Mycoloth. I would also say that your instances are a bit lacking at a measly count of 3. A bit off topic but am I the only one who thinks Skullmulcher should of been called skull muncher? Just browsing your list I only saw one source of haste that being Hammer of Purphoros you may want to look for more, perhads Madrush Cyclops or Fires of Yavimaya. If you don't need any more mass token makers there are thiongs like Predatory Advantage, Jund Battlemage, and Ant Queen