doctorhydrogen

The first thing I'll say is that Merieke can cause very unfun games because she tends to make people want to just sit there and not play creatures because they know the second they do they'll lose it. I disbanded mine after a dozen or so games because it generated a crappy, unfun board state. That said, my deck was filled with a gazillion ways to untap her, sacc creatures, etc. Yours looks less likely to generate that kind of chilling interaction, so good luck with it.

You need ways to handle problem artifacts, enchantments, creatures or lands.

Decimate- Kill one of each for 4 mana is a great deal

Deglamer, Unravel the Aether, Fade into Antiquity- All hit artifacts and enchantments, all can take out indestructible Theros gods or Darksteel stuff, all keep enter-the-graveyard effects from triggers, and the first two will also bury annoying enchantment or artifact commanders. I'd run all three.

Predatory Advantage is a stupidly good EDH card, but since it makes lizards it might not fit your theme.

Beast Within is, imo, the most versatile EDH card in green. It handles ANY problem.

Reforge the Soul is a nice cheap way to refill your hand.

Blasphemous Act is a nice cheap board wipe.

Command Tower is a great land for any EDH deck.

You could use some ramp. Sol Ring isn't too expensive, neither is Gruul Signet or things like Kodama's Reach or Cultivate.

I'm running something similar, and my friends let me run Huntmaster of the Fells as the general 'cause they're cool like that. Never hurts to ask the people you're playing with.

You could run Master of the Hunter (old Legends guy, not Wild Hunt).

Lurking Predators would fit nicely.

I'll keep every suggestion under a buck:

Mystic Remora are going to draw a lot more cards than Treasure Trove for a lot less mana. I dropped a Mystic Remora on turn five I think in a four player game this Tuesday, and I drew six cards with it before I even had to play the upkeep once. I doubt you have it lying around since it's a twenty-year old card but you can get both online for a buck.

Darksteel Ingot > Obelisk of Bant. It produces the same mana for the same casting cost, and it's indestructible to boot. Less than twenty cents and readily available from M14.

Signets > Prismatic Lens. Personally I'd run all three (Azorius, Selesnya, Simic). They're my favorite mana rocks after Sol Ring.

I'd run Coalition Relic (or Boros/Rakdos/Orzhov Signets) over Bloodstone Cameo.

Dolmen Gate is amazing in Kaalia, it lets you attack with her every turn with no fear of her dying, making sure you get to drop a big creature every time even if the other person has blockers.

Master of the Feast will be a nice fit here when it gets released with Journey into Nyx.

Magus of the Jar and Whirlpool Warrior make nice wheel creatures.

Rise of the Dark Realms to play all the creatures you wheel into their graveyard?

Creatures? Honestly I'd cull down to 26, no more than 30 tops, and fill the other slots with utility spells, i.e. ways to deal with enchantments, artifacts, maybe board wipes, etc. As it stands right now if someone drops a Platinum Angel or No Mercy or Moat you're rather screwed. Revoke Existence, Return to Dust and Deglamer all hit artifacts and enchantments, and they exile or tuck so they also handle indestructible Theros stuff. Oblation, Condemn and Swords to Plowshares would be solid spot creature removal, and Mass Calcify would make for a nice board wipe that will miss a lot of your creatures.

Konda's Banner is an insane buff in Sisay and Wheel of Sun and Moon lets your legends rotate back into your library for fetching again, as does Mistveil Plains.

Karakas is banned in EDH.

Both Sisay and Asmira are generals one builds around. Sisay you'd want a ton of legends that do game-impacting things and ways to reuse her ability (Wheel of Sun and Moon or legend anthems like Konda's Banner) and Asmira you want a way to put creatures in your graveyard in beneficial ways (token saccrifice perhaps?).

I'd run a bit more land since you have no other ramp (mana rocks, green land-fetching instants/sorceries), or just add a few more rocks (Sol Ring, Selesnya Signet, Gilded Lotus, Thran Dynamo, etc).

Beyond that things look good. You just need to find your deck's theme and what you want it to do.

do or die would fit here nicely

1) Drop an island for Rift

3) Bracers have the advantage of not requiring 2 colorless every time you use 'em.

4) IMO three is fine. I'd swap Reliquary Tower for Spellbook to offset the loss of the land from 1)

5) I'd say Flare for sure, especially if you play multiplayer primarily. In a four player pod you're helping not just one enemy but three enemies. That's three times the chance someone has to blow up. If you were running a deck with 15 X damage spells or something I'd say it was worth the risk because you'll benefit more than anyone else, but as is Flare could really backfire.

6) I might be in the minority here, but I personally am of the mind that in a two color deck 38 land is plenty, especially with that many mana rocks and that many fetches to both thin your deck and assure you have the right combos. Visions I'd say is also disposable, but you could also cut a few lands.

*) Consider Thassa, too. Even if you never hit her devotion having an indestructible way to skip past lands in the late game can be invaluable.

I ran something similar until Nekusar was released and I realized the same concept worked much better there. That said, if you don't want to port over to Nekusar:

Cyclonic Rift = Wash Out on steroids.

Since you're running Blue Sun, Invoke and Mind Spring I'd say throw in Braingeyser as well.

Illusionist's Bracers double up the Niv/Arcanis/Archivist taps.

I'd yank a land and pull Spellbook and add a Reliquary Tower.

Thought Reflection? Because if drawing seven cards is good then drawing fourteen is better.

Psychosis Crawler? Because if drawing fourteen cards is good then dealing fourteen damage to each enemy when you draw them is better.

Well a good EDH deck isn't going to hardcast Avacyn but instead sneak her into play via Quicksilver Amulet, Tooth and Nail or Defense of the Heart.

IMO way, way too many people in EDH over look the power of exile vs. killing stuff. I constantly see decks running Naturalize instead of Deglamer or Unravel the Aether or Fade into Antiquity when there are three Theros gods and a Darksteel Forge in play, and the person shows up the next week still running the Naturalize so the same thing happens again. There was a guy last week at the table playing B/W bitching about being unable to kill an out-of-control Predator Ooze with the Murder and Doom Blade in his hand, but I bet he doesn't replace them with Unmake or Sever the Bloodline this week.

I actually stopped playing when Legends came out and just came back about this time last year, and it was insane to see card values on the old stuff I used to have. But even in the last year things have skyrocketed. Fetches I picked up for 30 for commander decks in March of 2013 are 70 now, Liliana from 30 to 70, Edric to 20, Avacyn from 11 to 25, etc. Nuts.

I believe he started seeing some play in modern. Plus he's only been printed in one set and it was a short run, so I think speculators have driven the price up as well. I actually just scooped a dozen Ghave Guru of Spores up off tcgplayer because he along with Zendruu are the only generals left from the original Commander run under 10 bucks. Worst case I can always trade them and get back my 25 bucks, but I'd wager that this time next year Ghave is sitting at ten.

You could get down to 26 creatures pretty easily and not notice. Spined Thopter and Vault Skirge maybe? If you haven't played this deck much maybe do some test dummy hands with another deck of yours and see how Phyrexian Vatmother works. I found it absolutely did more damage to me than other people. I can think of at least one game where it straight-up killed me and didn't kill anyone else. Maybe you'll find it to be worth it, but I'd also consider pulling that one.

In a two color deck I'd be okay running just 37 lands, too, so you could free a slot there.

I'd also swap Turn Aside for old-school Counterspell. It's under a buck and the flexibility is tough to pass up.

If you're looking to add a few more duals for budget try manabasecrafter. com to get a full list of all lands for your color combination. There's a handful of sub-dollar ones (Rootwater Depths, Waterveil Cavern, Jwar Isle Refuge, Salt Marsh off the top of my head) that can diversify your land base cheaply. The land batteries like Subterranean Hangar also work well with proliferate effects. I don't think I'd run the Fallen Emprires ones because they're worse than the Masques lands and four is too many, but in my deck I ran both the blue and black Masque land batteries to decent success.

All those green mana symbols would love Nykthos, Shrine to Nyx.

Nature's will is a nice way to get to use those lands twice per turn, and it's dirt cheap if budget is an issue. Seedborn Muse would do the same but it's about seven bucks.

IMO never run Naturalize when you can run something like Deglamer or Unravel the Aether. There's just too many Theros gods in EDH decks and too much Darksteel stuff to get stuck staring at a Thassa you can't deal with using a Naturalize. It's gotten so bad that aside from Krosan Grip to deal with Divining Tops I run only tucks or exiles for artifact/enchantment removal. Destroy just doesn't cut it.

Given all the big creatures you're running including Omnath it's possible Triumph of Ferocity would be a free card every turn for you.

Since you're probably going to be tapping all your lands each turn to feed Omnath Calming Verse would be a good value since it's going to hit every enchantment but yours.

Bramblecrush has the same exact converted mana cost as Creeping Mold but it also will kill Planeswalkers.

I ran Vela infect for awhile. The biggest problem was she was really hard to play multiple times if she got killed, and if she wasn't in play it was hard to get your fragile creatures through. My deck lived and died by having alternate ways to make stuff unblockable.

Things that do it that are within your budget: Dauthi Embrace, Trailblazer's Boots, Prowler's Helm & Levitation. And while I wouldn't normally recommend an aura since it sets you up for a 2-for-1, Protective Bubble is pretty solid since it gives shroud, too.

Edric himself is close to 20. I think he was three like six months ago.

Even in budget no reason to run Manalith over Darksteel Ingot.

Gigantomancer would get along great with all those cheap 1/1's.

If you want to double up your non-basic land hate Back to Basics pairs nicely with Blood Moon