DedWards

If you choose to forego the Eldrazi in favour of big Green creatures (like Worldspine Wurm), you could use Summoner's Pact to fetch the big Green and Dramatic Entrance to put said big Green onto the battlefield at instant speed.

Alternatively, Assault Formation can supply you with an alternative win condition. Imagine attacking with Traproot Kami while Assault Formation is out :P

Holy crap, Meren is "absurd" :P

Ok, now that we have a combo to concentrate on, I can give you advice.

Firstly, as with any combo, you want 4 of each your combo pieces, this will increase the chances of drawing them every game. So 4 Bear Umbra and 4 Hellkite Charger.

Secondly, a few cards to search for combo pieces is always good. This can be done with cards that specifically say "Search your library for xxxxxx"; or "Reveal the top x cards of your library, reveal xxxxxx, and put it into your hand." or even draw and scry cards. Depending on the type and quantity of the search cards, and the combo, you could even reduce some, or all your combo pieces to 3 copies each, but never below 3.

Next, because your combo pieces do cost a decent amount of mana, and the fact that you're playing green, mana dorks (Llanowar Elves; Birds of Paradise; etc.) would be useful. I suggest mana dorks that come out cheaper, 1 mana is best, but 2 mana is doable too; and can either tap for any colour mana or for green and red, your combo colours.

And lastly, the key to any deck, 3-4 of each important card, and stick as close to the 60 minimum as possible. So identify what's important, increasing those numbers, and cutting everything that does not contribute to the goal of the deck.

Some cards for you to consider:
Ichorclaw Myr
Phyrexian Crusader
Inkmoth Nexus
Lashwrithe

Vines of Vastwood is more versatile than Ranger's Guile as you can use Vines of Vastwood to prevent the opponent from targeting one of his own creatures. I've actually done this once, the opponent was playing the Knight Fall combo, combo'd off, fetched Rogue's Passage as his last land, then tried to make the Knight unblockable for the win. I cast Vines of Vastwood on the Knight in response, blocking with an Elf Warrior token, then proceeded to kill him the next turn :P

Simic Charm is also worth considering, the mass hexproof is handy.

I've been running two Dosan the Falling Leaf in the sideboard of my Elf Warrior deck for a few weeks now. Helps a lot against Turbo Fog and counter heavy decks.

I've also been running two Natural State in the Elf Warrior sideboard. This helps a lot against Bogles / Aura Hexproof.

I can see Vapor Snag being useful too.

I agree with the reason to not include Fate Transfer. I merely suggested it as a possible addition.

Was looking up some lands that may help. It's sad you don't have access to White, because Gavony Township is awesome with Hardened Scales.
Llanowar Reborn is an interesting land, while it enters tapped and only adds green, it does have Graft 1, giving a free counter to Sage when it enters the battlefield. Combo'd with Hardened Scales, Llanowar Reborn can provide more than one counter.
Oran-Rief, the Vastwood and Novijen, Heart of Progress suffer the same drawback of only putting counters on creatures that entered the battlefield the turn you activate it.

Simic Guildmage (not Zameck Guildmage) might be worth considering. For {1}{G} it can move a +1/+1 counter from one creature to another, and with Hardened Scales out, the number of counters will increase.

Other cards, in colour, that can move +1/+1 counters include Bioshift (which you're already using) and Fate Transfer.

http://www.mtgvault.com/dedwards/decks/the-end-of-the-maze/

How I would build to win with Maze's End :P

The best shell I've seen around Maze's End is a turbo fog deck. Just fog, etc. Until you've accumulated the Gates needed to win off Maze's end. I can also see Amulet of Vigor working nicely with the Gates and Maze's End.

Thought-Knot Seer will help a lot while you work up to the other big Eldrazi.

I've always wanted to work in a set of Bramblesnap into an exalted deck, but never got around to it. Alternatively, Knotvine Paladin works pretty well with exalted too.

Managorger, while a good card, doesn't meet the requirements of "a use for all that mana".

Next thing, you don't seem to really have a use for all that mana. I'd suggest choosing a really big Green or Colourless creature to sink that mana into. I'd start "small", maybe a Hydra or something. Genesis Hydra would be fun.

What's the point of Sylvan Scrying? You only have basic lands, and Sylvan Scrying puts it into your hand. What you want is something like Rampant Growth, which can put the land directly onto the battlefield. Sylvan Scrying is only really good when fetching nonbasic lands.

Sadly, Aqueous Form doesn't trigger Blistercoil Weird as it's not an instant or sorcery. I would personally use Artful Dodge because it can be cast twice in one turn, getting two triggers off the creatures' ability.

Dismember is the next cheapest mana removal for Boros after Path to Exile, Lightning Bolt, and Lightning Helix. The only other option I can see is Lightning Axe, but with that you have to discard a card or pay an additional {5}.

You can fetch Tentacruel off Nahiri's Ultimate. Also, her looting effect can shuffle your graveyard back into your library if you discard Tentacruel. So it's not really a pipe dream.

No Paths? The more nonbasic lands they run, the less likely they'll have a land to fetch. Also, why no Bolt?

You mean Slip Through Space? There's a toss-up between Slip Through Space; Artful Dodge; or Distortion Strike. Slip Through Space draws you a card; Artful Dodge has flashback; and Distortion Strike has suspend.

Only if you're planning to win off Grapeshot's damage, this deck wins off creature damage (either Swiftspear or Blistercoil) thanks to Prowess triggers and pump spells.