DedWards

I would consider Chord and Mycoloth, but sadly, outside of forking money out for them, I can't get any. This is more a fun idea and any money I spend will go towards my (slightly) more competitive decks. If the chance does come up, I'd gladly trade for them.

Kor Firewalker sits in my W / WX sideboards just because of burn.

Here's my take on the combo:
http://www.mtgvault.com/dedwards/decks/tainted-arcane-roar/

Here's my take on the combo:
http://www.mtgvault.com/dedwards/decks/tainted-arcane-roar/

Here's my take on a non budget version:
http://www.mtgvault.com/dedwards/decks/tainted-arcane-roar/

Lucky for me, the person I played didn't have Kessig Wolf Run, nor any source of red. Also, I was gaining a ton of life thanks to Soul / Essence Warden, so I didn't need to block as often. Ready // Willing also helped (he sided in Ratchet Bomb).

The rest of your creatures are plenty scary (for the opponent). I know you're heavy creature based, but have you thought about maybe adding Boros Charm? The indestructible option is a game changer. They often rely on the kill to stop you, just like my use of Ready against Ratchet Bomb. The 4 damage to the face is OK, but the double strike on a pumped Knight is awesome and could be useful against Hate Bears.

Hero of Leina Tower sounds great on paper, but in practice I've found that having to pay for the +1/+1 counters leaves you with little to no mana for other spells. Favored Hoplite is arguably the best 1 drop Heroic creature. Also, have you considered Ordeal of Heliod, at least as a sideboard card? The 10 life it grants is awesome.

With Splinter Twin banned, I've been working on a variant of Midnight Guard + Presence of Gond that has a solid backup in the form of Sprout Swarm. While testing it at FNM a few weeks ago, I played against a similar build to this and I found a few ways to defeat it. While the combo is cool and all, you still need to deal damage with the attacking Knight of the Reliquary, and thanks to Sprout Swarm being an instant, I always had a blocker. Life gain + reliable blockers (ones that can't be tapped or won't stay tapped) is another weakness to the combo.

Fun fact, Surgical Extreaction (and Extirpate) can target nonbasic lands in graveyards :P

One deck I'm considering supporting supporting, even though I hate playing control, is Blue Moon. Blood Moon (and Magus of the Moon) will screw over not only the Eldrazi land base, but a lot of other Modern decks' lands. While I hate playing control, a friend is working on a tempo variant of Blue Moon that, if I had the money for the cards, I would adopt, but I'll settle for helping him with the deck instead.

Another card I've heard could be useful to mess with the two main Eldrazi lands is Painter's Servant. Both Eye of Ugin and Eldrazi Temple specify "colorless eldrazi", so Painter stops that.

While you're rite about the Eldrazi decks being heavy on creatures, some of those creatures can provide a buffer against removal. What I mean is, some of the Eldrazi have ways of protecting themselves from removal spells. Specifically, Reality Smasher forces a discard against any targeted removal, Thought-Knot Seer can remove said removal from hand and they also often run Spellskite to absorb those removal spells. That said, removal that exiles (Path to Exile, and maybe even Magma Spray?) might be better than burn, destroy, or -x/-x against Matter Reshaper as it replaces itself if it hits the graveyard.

Another problem we need to work around is Chalice of the Void. With the Chalice in the equation, we will need our removal to have different casting costs and possible artifact hate in sideboard. Path to exile costs 1, Dismember costs 3, Selesnya Charm costs 2 (it exiles power 5 or greater).

With all that said, I'm thinking Selesnya, or possibly even Naya. Path is white, Selesnya Charm is GW, and Dismember can be paid for with life, or if the Eldrazi player has played his Urborg, Tomb of Yawgmoth, he gives you the black required. That's 3 trageted removal, two of which exile. In a Naya build, Magama Spray could come in from sidebaor to take care of Eldrazi Mimic and Matter Reshaper (or anything left on 2 or less after blocking our creatures).

As for Reality Smasher's discard effect, it can actually be used to our advantage. Wilt-Leaf Liege and Loxodon Smiter would be put onto the battlefield for 'free' and it allows for Madness triggers (I'm looking at Fiery Temper here).

Gavony and the Captain are definitely stronger options, but like you said, without the better duals, a 3rd colour isn't exactly viable. I normally run my Thallids GW (with Gavony, Captain, and Pallid Mycoderm), but I REALLY want to use my Paradox Haze too.

GB is an option I haven't tested. Opens up to Deathspore Thallid and Thelon of Havenwood (in addition to a ton of kill spells). Might try work on a GB after testing this one out. I'm looking at a set of Death Pit Offering in my folder...

Goatnapper's ability to steal will be negated by Torpor Orb.

I was originally going to make this 3 colours, with White as the splash, and use Gavony Township and Sigil Captain, but then I realised the Guildmage and Novijen do practically the same thing without the need for splashing a 3rd colour. Should I put a 2nd Novijen in?

Good point. How's this?

It's been a while since I updated it, so it still shows Mercy Killing in the Sideboard. Sleeper Agent was removed and other cards amounts shuffled to make room for Mercy Killing, but here it is:

http://www.mtgvault.com/dedwards/decks/strong-hold-on-discipline/

I made and played a creature granting deck a while ago and Mercy Killing was just awesome sauce in it :D

Firstly, that's too many Elspeth. I'd cut it way down to only 3 Sun's Champion as it's a [+1] thats putting out 3 Tokens and her ultimate is an Anthem effect. With the space that is opened by reducing her numbers, I'd include Intangible Virtue and Path to Exile. This should bring your curve down and make for more reliable plays and Path is (arguably) the BEST removal card in Modern.

Mercy Killing

I wasn't aware of his price tag. I've had a set for a while now.

Ezuri, Renegade Leader has an activated ability that is effectively Overrun, plus he can regenerate any other Elf you control (just not himself).