Hey Cobb, thanks, and thank you for your list. I havea few more things for you after giving this deck some more thought. As important as what to put into the deck is what to cut.

My suggestion is cut anything that is filled by your commander. Most fatties and most "move +1/+1s onto other creatures" cards are just obsolete if you could cast Marath instead. For instance, Forgotten Ancient is rarely going to be better than your commander, and so are most fatties. Omnath, Locus of Mana , Platinum Angel , Jugan, the Rising Star , and Godsire , Azusa, Lost but Seeking , Dragonmaster Outcast , and Sakiko, Mother of Summer have very little synergy with Marath. Any of those big green fatties is undoubtedly worse than Woodfall Primus in this deck, for instance. I'm not saying cut them but they don't seem much better here than in any random goodstuff deck. Same thing with some of your big spells such as Genesis Wave , Green Sun's Zenith , Increasing Savagery , and the absolutely terrible Decree of Savagery . . These cards are at their best in green ramp decks, but are you really a ramp deck? I think if you want to go this route you should play up the ramp theme a lot more, with cards like Oracle of Mul Daya , Primeval Titan , Dryad Arbor (which you can Zenith for), Sylvan Primordial , Terastodon . Avenger of Zendikar is notable for also working well with all other Marath mechanics.

While I'm at it, I thought of a few more cards for this deck this afternoon. Obviously not all of these directions can be explored in one deck, but here goes.

First, the ascensions are better here than in any other deck I can think of for them.Luminarch Ascension and Beastmaster Ascension . Think of all the ways these ascensions rock here. They turn on faster from Doubling Season and maybe a Contagion Engine , and then Doubling Season and Primal Vigor double your angels. Both angel tokens and Marath tokens like anthem effects, and Beastmaster Ascension is one of the biggest anthem effects. Speaking of anthems, Eldrazi Monument is one of the best anthems if you have a nearly infinite source of creatures, which, hey hey, looks like you do. Marshal's Anthem is probably the third best anthem because of its reanimation effect.

If you're playing Ascensions you're already getting tugged towards proliferate. Another thing that makes proliferate look good are the Myojins. Myojin of Life's Web is the best, but a properly rampy deck could also consider Myojin of Infinite Rage . Yes you can proliferate those divinity counters for repeatable Myojination.

Finally, how the heck could I forget the Spikeshot Elder and Spikeshot Goblin ? I once made a deck built on Spikeshot Goblin , Seedborn Muse , Soul Foundry , and silly equipments like Vulshok Gauntlets .

I've gotta go post my own list soon!

I posted my own list, I added a few more ideas. It's not done yet of course I need to add basic removal and ramp packages and land, but what do you think.

http://tappedout.net/mtg-decks/marath-is-tricky/

Note that Sakiko says combat damage, so pinging doesn't work.

Also, I had a few more ideas: Wirewood Savage , Viridian Joiner , and Perilous Forays

Sorry it took me so long to respond (computer issues). For Mana Echoes , I would probably take out Karametra, God of Harvests (I just don't see it doing that much), or Deadbridge Goliath (I can see it as just a great card with synergy with Marath, but other than that...)

If you have 6 mana and cast marath for the first time with doubling season and food chain on the field, you can produce infinite mana, infinite power/toughness for marath, and burn all your opponents to death.

6 mana up

1.) cast marath (6/6 because of doubling season)

3 mana up

2.) remove 3 counters from marath to create 6 saprolings (because of doubling season)

0 mana up

3.) sacrifice marath & 6 saprolings to Food Chain

10 mana up

4.) cast marath again (enters as 10/10 because of doubling season)

5 mana up

5.) remove 5 counters from marath and make 10 saprolings (season)

0 mana up

6.) sacrifice marath and 10 saprolings to food chain

14 mana up

7.) Cast Marath (enters as 14/14)

7 mana up

8.) remove 7 counters, make 14 saprolings

0 mana up

9.) sacrifice marath and 14 saprolings to marath to food chain

18 mana up

10.) cast marath again as 18/18

repeat until marath is 1000/1000 then instead of creating saprolings use the mana to have Marath burn all opponents to death.

I seem to always get crazy board states running Hero of Bladehold and Ogre Battledriver . Ogre Battledriver makes the tokens go berserk and combos nicely with battle cry from Hero. Makes other tiny token generators like Avenger of Zendikar work as aggro.

Lastly, Beastmaster Ascension works well if you like the hasty version of Marath using Hammer of Purphoros or some other haste giver.

Aether Charge and Tooth and Claw should go in.

AEther Charge is pretty much an awful version of Warstorm Surge . Especially in this deck. I run like, no beasts, and my tokens are elementals unless I'm playing Rampaging Baloths .

Tooth and claw is pretty bad for what it does. It came in the precon deck and was one of the firsts to come out.

Cut Assemble the Legion for Greater Good

The deck isn't completely updated anymore, that switch was already (pretty much) made lol

The one thing I can think of is replacing Avacyn, Guardian Angel with Druid's Deliverance , which allows you to populate as well as prevent combat damage. But then again, Avacyn is reusable. Otherwise, strong deck. +1

First off, thanks for making an awesome deck. You gave me a lot of good ideas to improve my deck, Rudolph, The Flame Farting Reindeer. Especially with Ashnod's Altar. That card is broken with Marath. I love it. It combos with Illusionists Bracers, Doubling Season, Parallel Lives, a lot of cards, so its nice, plus it gives me the mana to boost up my X costing creatures. I really like Chorus of the Conclave because the extra mana you pour into marath casting him counts as his cost, so you basically get to put double counters on him. Another thing I've found is really efficient with Ashnod's is Skullclamp . For one tapped land, you can draw as many cards as Marath will allow. It's super efficient. Anywho, if you find the time to take a look at my deck I would appreciate some feedback. I feel it's coming together, but it's hard to criticize your own baby, ya feel me? Rudolph, The Flame Farting Reindeer

Just saying Hushwing Gryff counteracts Marath, Will of the Wild

Wait scratch that

Just out of interest, what does your marath alter look like? Could you post a picture please?

I like the deck, though I cannot fathom the reason that you don't run Mentor of the Meek and Skullclamp . Creating 1/1 elementals, drawing a card off of mentor, then drawing 2 off of clamp is really good if you can get the engine going off.

The alter is only halfway done right now, I plan on finishing it this weekend and then I'll put a picture in the description. It's basically evil Marath lol.

And to simply answer your question as to why those cards aren't here is cause I don't have them. I'm getting Skullclamp soon, and mentor of the meek might make it in here, the kicker is paying that mana (hell I don't even like paying it for seer's sundial)

Which I should probably explain was in an older version

What about adding a Chromatic Lantern to help with the potential problem that is a 3 color deck.

The deck has had some real life changes made to it that are not reflected here, one being chromatic lantern is in here.

Damn, that is a pretty bad ass alter. I would suggest if you run into any nagging / annoying judges to have an unaltered marath because i think that all of the important info is hidden. I don't believe that you would fake a card, but there are jackasses that will make the case to get an easy win.

Thanks man.

And yeah I play casual EDH, my lgs doesn't host many commander tournaments as far as I'm aware so I haven't had the chance to play in something where that would come up. But I have a nonaltered version behind this and my other altered commander in Five-color Beatdown and Reanimator so people know what they do.

There is a good case to be made here for Cultivate, Kodama's Reach, and Dryad Arbor. This deck profits exponentially from recasting Marath so having more mana is always great and thinning the deck of land will make increase your odds of a profitable draw. The arbor is a forest land creature of cmc 0 so you can fetch him with things like Wooded Foothills, Windswept Heath, and Skyshroud Claim. Better still you can sac him to Nature's Claim or ramp on turn 1 with Green Sun's Zenith for x=0.

use Earthcraft with you commander for infinite tokens.

If you ever want to be more constant or stable with your enchantments or artefacts you really should try putting in some tutors like Enlightened Tutor or Idyllic Tutor. Giant Adephage is cute, but is no game ender, if you're looking for a more budget version of Craterhoof Behemoth, go for Pathbreaker Ibex instead. Skyshroud Elf is also a great addition as a mana dork with ashnod altar. I would cut White Sun's Zenith for it, since you want some more ramp or mana filtering than ways to use your mana. Maraht is pretty good on its own for that. There is always MTGTop8.com if you want to see some competitive decks.

I just started building a marath deck and a got a few more additional ideas from yours. It's still in progress, should be done in a week or so once I can trade for the cards I need. I would suggest adding hardened scales as it has a similar interaction to doubling season/primal vigor when it comes to counters (as you can add counters one by one). Also definitely add purphorous (the god) if you are going the token route.