Okay, I'll explain some of it.
The deck is, and plays like, a mashup of Eldrazi Aggro and classic 12-Post. It's quicker to the ground than 12-Post generally is without sacrificing inevitability. It's not as fast as Eldrazi, but it has more staying power. It does not have the turbo that 12-Post can have with
Candelabra of Tawnos, but again, it still has a much better early game.
The biggest weakness of the deck is its inability to improve card selection. There's no tutoring, shuffle effects, or library manipulation. Because of this, the deck needs to be proactive about putting up defenses and advancing its board state via card quality. Almost every single deck has a problem with Sphere effects: there is a reasonable chance of landing a
Trinisphere on turn 2. The deck has seven maindeck Needle effects to combat combo and
Wasteland. The other 1-drop is
Relic of Progenitus, which fights
Deathrite Shaman,
Tarmogoyf and
Gurmag Angler as well as the more obvious graveyard-based combo decks. It also has play with one of the deck's main threats, which I'll outline below. The last "hate bear" is
Silent Arbiter, which is tough to kill in combat, can't be answered by
Abrupt Decay, and stops one of the things Post often has problems with: creature swarms.
The deck has ten creatures which qualify as threats.
Emrakul, the Aeons Torn is obvious, as is
Ulamog, the Ceaseless Hunger. Since this deck has to be proactive, it tends to dump its hand fairly quickly, which is why I think
Kozilek, the Great Distortion makes slightly more sense than Butcher of Truth. I average about five cards drawn per activation. In addition, Kozilek can protect the rest of the board, and with a Silent Arbiter on the board he can't be blocked.
Thought-Knot Seer is also an awesome threat. This deck has a reasonable chance of dropping one on turn 2, and in addition to just being a solid body, it also can pre-emptively answer combo or sideboard answers. Lastly is
Oblivion Sower. He's, well, interesting. At 5/8, there is pretty much no Legacy creature that can actually kill him in combat without deathtouch or friends. The cast trigger is also huge. Taking out four cards can lead to sideboard answers getting removed. Grabbing a
Wasteland or
Karakas is awesome. Anything that taps for mana ramps you. Also, it is a slight hedge against
Blood Moon effects: Sower can be cast under Moon, and even if you grab a fetchland or something, under a Moon you can tap it for mana.
All is Dust makes sense as a sweeper here as you can get it to 5 mana under
Eye of Ugin and it doesn't touch your board. Lastly, this deck has room for both
Ugin, the Spirit Dragon and
Karn Liberated. Both make sense in this list. Both can win the game by themselves. Ugin can sweep, and Karn functions as spot removal, which the deck otherwise lacks. With a slightly higher creature density, the deck is more likely to be able to protect them: especially with an Arbiter out.
The deck also wants to draw more cards.
Coercive Portal helps with that, although it would be nice to run more than two.
The sideboard is mostly self-explanatory.
Ratchet Bomb can answer tokens, Needle effects, or
Chalice of the Void on one. If you can board out some of your own 1-drops, Chalice becomes excellent for us.
Cursed Totem answers any creatures with abilities that matter:
Qasali Pridemage,
Knight of the Reliquary, Elves, or whatever else. There's more grave hate with
Grafdigger's Cage and more Sphere effects to give you a better chance against most combo decks.