doctorhydrogen

Kaysa? Dirt cheap and helps a good portion of your critters.

Since cost doesn't seem to be an issue, I'd for sure throw in a fourth Sublime; that card is sick. Qasali Ambusher is nice for flash I guess, but in a exalted deck it's not like you're going to be fooling anyone into thinking you don't have defenders, and if all you care about is reach why not go with Court Archers, or Dawnray Archers for sniping?

I'd have a tough time passing on Kasya in a mono green. That doesn't help your cut 6 problem tho.

However, since we're not talking about the theoretical value of blue/green vs. black, here's a comment or two about this particular deck: First, I'm not a huge fan of either Servant of Nevarox or Duskmantle Prowler. I'm not sure 1 extra toughness or haste is worth the added mana over just adding two more Knights of Glory. I don't love Angel's Mercy, either; slapping a Spirit Link on a creature right before it attacks will get you 7 life pretty often in an exalted deck, and it might well be around for multiple turns. Lots cheaper, too. I also find it really hard not to throw a couple of Sign in Blood in a black deck. You tend to blow your hand out pretty fast, and I can't count the number of times drawing two cards has been the difference, and I've won more than a few forcing my opponent to draw when he's at 1 or 2 life.

I love exalted, but IMO people get too hung up on using black. I don't know that it brings anything to the table you don't get from green or blue. Ardent Plea alone makes it hard for me to pass on blue, and you get the flexibility of Steel of the Godhead and Curse of Chains.

I'd swap at least two Dark Favor/Divine Favor for Spirit Mantle. Making your attacker near unblockable is going to be worth a lot more than the buffs (plus they still get 1/1). I'd also be tempted to consider a couple of Sign in Blood as I always find myself with an empty hand about turn 5-6.