No Rock Lobster? XD
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This has too few creatures to actually work. 99 games out of 100, you're not going to draw the creatures you need to get this off the ground. It's far too focused on the spells themselves, and not the creatures that they target.
I thought about building my deck in a similar fashion, but it's nearly impossible to rely on stealing an opponent's win condition being the only way to win with a deck. It might be worth it to throw a couple of decent strong cards (and definitely some counter magic) to make the cards that come out from your end of the Knowledge Pool good, just in case you completely whiff when you exile your opponent's cards.
I actually run an EDH mill-type deck myself, and I enjoy what's going on here. However, you seriously need some card draw in order to make this work well enough, because you WILL become a huge target in multi-player game. I'd say replace 1/4 of the mill effects with card draw of some sort. Also, make sure you have a way of dealing with Kozelik and Ulamog, as from my experience they keep me from being able to actually mill someone's deck out completely. Sword of Body and Mind isn't going to be that great in this deck because it has protection from blue, and you can't equip it to most of your creatures. Swap it out with Nemesis of Reason, 3/7 dude that really fits the theme of your deck.
This seems like it would be a fun deck to play. I do have a couple of suggestions though, the first of which being reduce the amount of prison terms down to two, four of them is just unnecessary. Secondly, Rustic Clachan does fit the deck, but other than possibly putting a +1/+1 counter on a creature isn't really doing much, I would get rid of them. Lastly, I think that Ajani Goldmane could make this deck beastly (with his -1 ability anyway). He would fit a little better into the deck than Elspeth, as it's damn-near impossible to actually get her up to 8 loyalty and get her ultimate off because of how much aggro she draws.
This seems like it would be freaking awesome. My only suggestion would be to put in Pestilence, so you can put Rain of Filth's mana to greater use.
This seems like it would be fun to play, but I do have to wonder why you're playing Broodwarden when you can only produce Eldrazi spawn tokens with 5 cards in the deck. I'd say ditch the Brood Birthings and the Broodwardens. I'd play 2 Kozelik's and I'd definitely put in a couple Composite Golems.
The biggest problem with this deck is that there just isn't enough land to run it. I can guarantee you that 9/10ths of your games are going to result in you never even being able to cast Hellcarver Demon. I'd say get rid of the Lava Axes and 1 Chandra. Also, I'd replace the Dark Rituals with 2 Lilliana's and 2 more lands. The spread would be something like this. 2 x Chandra Ablaze 4 x Lightning Bolt 4 x Staggershock 4 x Blightning 4 x Consuming Vapors 4 x Diabolic Tutor 4 x Hellcarver Demon 2 x Lilliana 2 x Emrakul, the Aeons Torn 2 x Ulamog, the Infinite Gyre 2 x Kozilek, Butcher of Truth 2 x It That Betrays 12 x Mountain 12 x Swamp Hopefully this helps.