You aren't really getting the full effect of Agent of the Fates or Tormented Hero with so little buffs but I suppose the hero is for a turn one drop. Also, are you depending on all your crazy removal to pump Nighthowler ? if I were you, I'd drop two agents and throw in two Desecration Demon everyone hates a Desecration Demon Have you considered Mogis's Marauder for the haste intimidate?

I still think desecration demon is a MUST on MBD

I actually find the bestow creatures to be better then the deamon. They have really preformed well for me so far. And they lack the downside of being tapped down. Also the bestow gives the "haste". I get triggers on my Agents roughly 2-3 times per game so far thanks to my preference of bestowing(also gives me a better curve) and has so far been nuts against control.

The deck is actually a really good beatdown deck and I have found that it works just as well as the normal MBD. With the upside of being more fun then pack rat'ing folks :)

So the Temples are strictly for Scry purposes? Wouldn't you rather not have to tap your lands when they come in?

The temples are purely for scry. I used to play the deck with 23 Swamps before but I found that I flooded or missed my early land drops to often. The temples have really helped me with that, and the deck is not really all to reliant on lands coming in untapped. The temples also have great synergies with Underworld Connections as it lets you dig for the right card you need. And after including them the consistency of the deck has gone up by a lot. :)

+1

4x Thoughtseize most annoying card ever. Its quite expensive, duress may suffice since you have so much creature removal.
3x Gift of Orzhova I like this card but without counters or ways to keep the creature alive, youre likely to just get 2 for oned.
4x Agent of the Fates This guy would be better if you had ways to keep him alive
4x Herald of Torment I love this guy, tho when you bestow him for 5, be careful as the agent of fates will probably just get shocked.
4x Nighthowler Should be OK with all of your removal but bad vs control or creatureless decks.
4x Pain Seer - You dont feel like you would get more value out of underworld connections?
4x Spiteful Returned I feel his bestow ability is average for 4.
4x Tormented Hero His trigger seems very average. Spending 4 or 5 to bestow him to get one life really sucks.
1x Nykthos, Shrine to Nyx in a mono deck with many dual black permanents, you should have more than one. You will play many games and never draw it. If this is what you want, better to have 0 than 1
3x Temple of Malice - In a mono deck will just make you unnecessarily slow.
3x Temple of Silence - In a mono deck will just make you unnecessarily slow.
4x Hero's Downfall abrupt decay or ultimate price may be better, with heros downfall in your sideboard

Strange deck :P as a bestow deck, youre missing the foundation white gives you with Hero of Iroas , Ethereal Armor and Eidolon of Countless Battles

if OK, please look at my deck Evenings Auras and let me know what you think. :)

I don't like the Tormented Hero, Agent of the Fates can work well with the bestow creatures but the Heros don't seem worth the trouble. I'd replace them with more removal.