I am new to the EDH format, and this is my first build. I know I need Doubling Season, Parrallel Lives, Kessig Wolf Run, and Dictate of Erebos, but what else am I missing? I would like some more tutors, but dont have the cash yet. I am also running Growing Rites of Itlimoc, Windgrace's Judgement, and Far Windings, but I could not add them for some reason. I appreciate any and all constructive criticism. I don't necessarily want to be hated, but I do want to be feared.

Welcome to EDH. Before I begin giving you suggestions about this deck I just wanted to let you know a little about the EDH format.1) EDH decks usually have about 36+ lands and some additional mana sources. I see you are running Cultivate and Kodama's Reach as well as a few artifact mana sources, but you will probably need to up your land count. 2) Most EDH decks that use their commander use Lightning Greaves and Swiftfoot Boots as ways to protect it and to give it haste so it doesn't just dies every time you cast it.

For mana sources Ashnod's Altar and Phyrexian Altar are great in your deck.

You can add Poison-Tip Archer to the group of cards that do damage when a creature dies.

Viscera Seer is a great sac outlet.

Skullclamp is a great source of card draw, especially in this style of deck.

Since you are making tokens... Ezuri's Predation and Sprout Swarm might be fun. Primal Vigor is another Doubling Season type of effect. My personal favorite in token decks is Eldrazi Monument

As for cuts to make, to make room for 12+ lands you have some tough choices to make (more cuts if you make any changes). Here are my thoughts and reasons:

Atarka, World Render I know your general is a dragon, but not really many other things in your deck are, so this might be a bit of a win-more card.

Beastcaller Savant you can get better acceleration somewhere else 1/1 creatures don't stick around long.

Burning-Tree Emissary 2/2s get outclassed quick in EDH and you aren't trying to storm.

Goblin Bushwhacker one time effect, then not much. This wants to be a Craterhoof Behemoth or at least an End-Raze Forerunners .

Kalonian Behemoth big creatures are big, but not sure it does much in your deck. Gets some Lightning Greaves or Swiftfoot Boots and build your own.

Phage the Untouchable a great creature and a lot of fun, but probably better in another deck.

Riftsweeper I don't think this works the way you think it does.

Ulvenwald Hydra and Zendikar Incarnate , these are better served in a lands deck

Autumn's Veil situational based on your groups meta.

Tainted Strike you better make sure to kill them with the only poison you are running

Titanic Growth +4/+4 might be nice in some cases, but I'm sure it is worth the slot, most things that are trying to kill your creature will probably still kill them after the pump.

Explore up the land count to make this matter.

Mana Cylix run better fixing so you don't need to filter your mana.

Hope this helps. I like your take on Prosh with tokens looks like a lot of fun.

mrdehring Thank you so much for your input. This is what I am hoping to get out of posting my deck.

In response to your feedback, I am going to share some of my insanity behind this. I would love to know if it makes sense, and/or if I can do it better and how!

As far as lands go, I researched about 6 or 7 Prossh decks. I averaged out thier land totals and thats how I came up with this. Crazy huh? I did try and build in as much ramp as I could figure out, thus Burning-Tree Emissary, and some of the smaller dorks. I have thought about protecting Prossh with Greaves or Boots but I get so much more for having to recast Prossh, that I am unsure if I want to protect him. As for the Altars, they are definitely on the list to buy. I just dont have them yet as they are a tad pricier than I expected, but will definitely be adding them shortly! I have seen a number with poison-tipped archer...and is definitely something I am thinking about. I have just seen Viscera Seer pop up more frequently, definitely something for me to consider! I spaced on Skullclamp, and is one that I will be adding. I am glad you reminded me of Primal Vigor! I totally forgot about it! I do like what Ezuri's Predation and Sprout Swarm have to offer. The Eldarazi Monument definitely looks like some fun. As far as Atarka goes,this is my madness, its a big dragon with flying, and allows for double strike. So, Atarka at 6, Prossh at 6 plus 6 (double strike) is 18 without anyone else coming to the party. I know, its only IF both are out, but, thats a handful. I am not "sold" on having it here, just trying to diversify a bit...lol. You are right with Beastcaller Savant, but he was cheap and gave me the +1s I needed until I could find a better card. Burning-Tree was only there for the ramp, as long as I could keep her on the field. Not one I care if it stays or goes, but that was the thought process. You are right about Goblin Bushwhacker. It is tehre until I can afford Craterhoof. Kalonian Behemoth is my filler for Craterhoof. Its not as nice and fancy and doesn't give what Craterhoof does, but its a big (ish) hexproof, budget option until Craterhoof lands in this build. Phage is there just for fun. I needed another creature card, and saw it in my collection and said,"what the heck?"
Riftsweeper, I have seen in a number of Prossh builds, and believe its a way to bring Prossh back easier. Thats the only reason its there. Zendikar Incarnate was another instance where I needed a creature and was what I had on hand. I had a number of lands the first time I played this deck, and thought it would be good, but,I am not sold on it. I can definitely replace it with something else. Ulvenwald Hydra is there for a few reasons: reach,gets better with land plays, and if necessary allows me to search my library for a land card. Autumns Veil is because I saw it also in a number of deck builds as a cheap 1 mana counter to blue spells. I do see a fair amount of control decks and this was something that I could do to possibly get through (once).

I hope this explains my thinking. Its probably off a bit, but there it is. Now to take your suggestions and see what I can come up with! Thanks for taking the time and the input! I really appreciate it.