DedWards

There's two problems with Azusa, Lost but Seeking here. Firstly, she's legendary, so multiple copies is bad. 2-3 copies should be enough, depending on how often you want to see her. Secondly, you currently only have 20 lands in your deck, so she'll outlive her usefulness very quickly.

Personally, with all the other ramp you have in here, I'd drop Azusa all together for another Hydra. Mistcutter Hydra has haste, so taking it up to 4x is good. Feral Hydra is a good early play that can also be a mana sink when not casting anything / much else. Vastwood Hydra's death trigger makes one or more of your other creatures much bigger. When Kalonian Hydra attacks, it double the +1/+1 counter on ALL your creatures.

Set legality doesn't seem to be a problem here because you're using Green Sun's Zenith, which is banned in Modern. Summoner's Pact is a Modern legal replacement. In fact, it'd be better because Green Sun can't fetch your X mana X/X creatures.

Adding Evanescent Intellect is probably not a good idea. Firstly, there's way too few creatures to reliabley use it. Secondly, it paints an even bigger target for removal on the creatures in here, and you'll be down two cards for one removal spell.

As for linking, we've had problems in the past with it, so the feature was removed. Although, I think they are working on reintroducing the links.

I'm personally not a fan of Consuming Aberration. It costs way too much to not have an immediate effect. If you want something for offense and defense, you can do better. Jace's Phantasm is one such better option.

Also, the crab should be 4x. It's just that good.

The reason for the ramp is because of Regal Caracal's casting cost. It also gives a turn 1 play and thins out the deck a bit.

Ooooo, a Through the Breach build of Challenge sounds like fun. Will need to look into it.

I still play Ponza. Looking at getting a pair of Trinisphere to test in the sideboard as most of Ponza's cards cost 3+ anyway, the exception being the mana dorks and the odd sideboard card. Hoping Trinisphere helps against spell heavy decks like Storm and anything that runs Snappy.

I only designed a Dubious Challenge deck. A friend actually bought all the cards for it. Can't wait for our next Modern FNM to see how it works in real life (my XMage games with it have been iffy).

Hard luck. Still, replace them at your earliest convenience. You won't be sorry.

Tainted Sigil seems like it could have a place here.

Just to add on to Muktol's suggestions, I'm not a fan of Mind Grind. Mind Funeral is far superior.

FYI, Bloom Tender will only add 1 green in this deck as the only colour permanent you have is green. Bloom Tender adds for each colour in permanents you control, regardless of how many of each colour you control. Eg: with Bloom Tender, a blue permanent, and 3 red permanents out, Bloom Tender will give you {G}{U}{R}.

On a related note, despite tapping for different colours of mana, unless something is giving it a colour, all lands are colourless.

Embalmer's Tools

Just remember, the Myojin only enter the battlefield with a divinity counter if you cast it from your hand. So cheating them in with things like Champion of Rhonas or Quicksilver Amulet results in them not having a divinity counter, and thus not being indestructible nor having a counter to remove for their abilities.

To fix this problem, I suggest lowering the number of Myojin (they are legendary) to include That Which Was Taken to give them and other creatures divinity counters.

Draconic Roar and Searing Blaze are effectively the same card, just with different conditions. I was looking for just one extra burn for 3 card as a filler and chose Draconic Roar over Searing Blaze just because I have the Dragons. As soon as I get more of the 'walkers I need, Draconic Roar will be one of the first cards I drop. I may even lower the number of Dragons the more 'walkers I get.

I'm not saying the card is bad, it's very good, but only in a deck dedicated to using its effects and that's not the direction I'm going with this deck.

Because Draconic Roar, along with a few other cards, are only filler until I can get more Koth and some Chandra, Torch of Defiance.

Ya, couldn't find space main deck for Path without hurting the synergy of everything else, but it definitely deserves a few slot in the sideboard.

All good cards, but none are creatures. Removal is a big threat to this deck, and each noncreature reduces the redundancy, and thus reducing the resiliency and ability to repopulate. Any noncreature card must have a very good reason to take a creature slot. Hardened Scales qualifies as it boosts a large amount of what the creatures where already doing.

Phyrexia's Core is another way to sacrifice Spine of Ish Sah or Ichor Wellspring.
Phyrexian Metamorph can copy any of your creatures or artifacts.

Phyrexia's Core can sacrifice Spine of Ish Sah to return it to your hand via its own ability, allowing you to replay it.
Phyrexian Metamorph can copy any of your creatures or artifacts, including Titan or Spine.

Sadly it only turns lands in play into Swamps, which means that Korlash's Grandeur still can't fetch them.

I have a mono black Korlash deck. For additional ramp, I run Wayfarer's Bauble, which works well in my deck as a lot of things I play cost 4 or rely on the number of Swamps I control (Lashwrithe, Mutilate, etc.). I also run Ghoulcaller's Chant, which can return a creature, or two Zombies, from the graveyard to hand. And Korlash is a zombie :P

Now onto stuff not used in my deck. Abrupt Decay is excellent at removing a lot of annoyingly strong cards in Modern, including Planeswalkers like Liliana of the Veil. You are running white, so Path is your strongest removal at one mana, closely followed by Fatal Push (I really need to work some Fatal Push into my deck). Anguished Unmaking is another viable option for targeted removal. A sweeper or two would be nice. Damnation would be best, but Wrath of God; Day of Judgment; Mutilate; and Languish all have much lower price tags.

I decided to try design a RB land hate deck:
http://www.mtgvault.com/dedwards/decks/darker-side-of-land-hate/