Every Rose Has Its Thorns

Thraximundar would be a nice addition also Solemn Simulacrum. I would also maybe go with another board wipe or two maybe Damnation. You can wipe the board and your creatures would come right back into play. I noticed that many of your creatures are four or more to cast I would possibly go with more mana ramp like Sol Ring, Coalition Relic or Chromatic Lantern. Maybe a lot to take in but, hope this is helpful, other then that deck looks great.

Just like every night has its dawn.

* Solemn Simulacrum is painfully missing. With all those ways to sacrifice creatures (and ways to get it back), this is a must, especially since it stands on it's own pretty well.

* I would prefer Sheoldred over Butcher of Malakir - less flashy but the free Resurrection part of it makes up for that.

* You said you don't want to focus on your commander too much because he'll end up buried somewhere anyway. I understand that notion all too well and can imagine your typical games. However, having said that, your current deck focusses a lot on it. As long as those cards are generally useful and can stand on their own, that's not problem. But we are 8 cards above 100 and there are always so many good cards to add that we should get rid of those cards that are mostly specialized on your commander and not that efficient to start with. I am mostly looking at Unspeakable Symbol here but since we have to more cutting:
- Unspeakable Symbol: Too conditional and only worth the life if coupled with your Commander.
- Fleshbag Marauder: I would prefer a Syphon Flesh over this guy. 5 mana instead of 3 but gives you more bodies and doesn't depend on your Commander.
- Keldon Champion: Hardly worth the trouble even if the Commander is present. Let me utter another concern at this point: Your main trick involves getting your guys back. This not only assumes you have your commander in play, it also means you have to attack AND it has to be the guy leading in life. That's not only a lot of conditions to meet, it also means you have to play aggressive all the time and whoever has currently the most life will atomatically feel threatened by you. Reducing the number of creatures that depend on sacrifice and being reanimated will not only make you less dependent on your commander, it will also make you less prone to graveyard hate AND less of a target!
- In the same vein I would cut down on the number of "everybody has to sacrifice" type of cards such as Braids. Braids may be too good as a commander if the deck is based around it, but as a regular card ... the opponent can choose what to sacrifice. Since most if not all EDH decks reanimate stuff in one way or another, you might as well HELP your opponent by giving him a universal sacrifice outlet!
- Ring of Valkas should still be the regular Lightning Greaves/Swiftwind Boots.

* From this deck and your description of the metagame and rules I take it that the decks of your pals are quite advanced. Which means they will all have considerable amounts of recurring and recycling cards. Your deck, however, lacks any kind of graveyard hate as of yet. You'll need something at least against creatures!
- Crypt Incursion: One of my new favourites, it screws a single player *at instant speed* and you gain massive amounts of life on top of it! The latter means you can always cast it for the life in times of need, so this will rarely be a dead card!
- Relic of Progenitus: This is your emergency kill switch. It hits everyone including you, however, you will most likely suffer the least since you mostly revive what got destroyed during your own attacks. And Relic cantrips when you pop it for the big effect, so it won't ever be useless, either.
- Withered Wretch: Reuseable pin-point exiling! It comes on a fragile 2/2, though.

* Mystical Tutor is generally superior to Merchant Scroll. I have never seen someone adding Scroll but no Mystical before. Yes, you get the card immediately with Scroll, but usually the broader options you have with Mystical will make up for it (especially since most of your possible picks will generate card advantage). You don't run Vampiric Tutor either, for that matter, which is usually added before Mystical :)

* Goblin Wardrums is another candidate to cut. I like this card and not just out of nostalgia, however, you have enough other cards with similar or better effects, only that the Wardrums don't do anything else besides making your creatures harder to block. Which is useless half of the times when you are not able to attack anyway or redundant when you have other cards like Sun Quan in play, and of "win-more" nature lots of the remaining times.

* Bitterblossom, while not a bad card, is probably also not good enough in this to keep it's spot. You'll get early blockers and tokens to sacrifice for your various Abyss-effects in case you don't have your Commander out. On the other hand it costs you life every turn, 1/1 blockers only get you that far in EDH where everything tramples and you can't opt to not create a token, even when you are down in life and don't need more tokens.

* Reins of Power: I consider this card such a gamebreaker that I would add it to ANY Commander deck that runs blue, regardless of the actual gameplan or strategy! At worst this will be a Fog for one turn, saving your ass when you play it after someone declared an attack on you. But this has so much potential, especially with your sacrifce outlets!

* Anger would probably be better in this than the Oger Battledriver.

* Entomber Exarch looks weak to me. For one more mana you get Puppeteer Clique! Please note how well persist works with your Commander (+1/+1 and -1/-1 counters actually cancel each other out) !

* While Persist works well with your commander shelling out +1/+1 counters, undying does not! Mikaeus & Co are probably still worth adding but keeping this in mind may force you to re-evaluate the choices you made.

* It's maybe not an issue in your metagame but you run a total of just 5 basic lands. Does nobody in your group play stuff like Back to Basics, Blood Moon or Price of Progress? I would consider to cut some of the lesser non-basics in favour of upping every basic land to 3. Combined with the fetchies this would give you a fighting chance if someone drops a Ruination or Back to Basics. Otoh ...

* ... if nobody plays these type of cards, probably because they all want to go heywire with non-basics themselves, then wouldn't it be a smart move to include something like Anathemancer in this?

* It's maybe because of your restriction rules regarding mass removal but I wouldn't want to play a EDH deck that has zero ways to handle enchantments and you only got a single spot removal for atifacts as far as I can tell. You run Reduce to Dreams but that isn't a permanent solution either. I'd certainly feel naked without a Disk-like effect.

* Fervor should be upgraded to Hammer of Porphoros.

I made it! The deck is now at 100 cards, and I am looking for constructive feedback. Please read the description before leaving your comments.

You might want to take a look at some of the new stuff Dragons of Tarkir brought it, mostly in the realm of the Exploit stuff. If anything, stick the new Sidisi in here because getting to tutor every turn is pretty insane.

Also, check out my Marchesa deck if you want and we can bounce off some ideas. Mine is more focused on sacrificing my own stuff and clearing the board with Grave pact and abusing ETBs and such. Yours has a bit of that too, but seems to be a bit more aggressive.