doctorhydrogen

Quietus Spike would kill in an unblockable deck. Grappling Hook grands double strike as well, though it doesn't seem as auto-include as Quietus.

I'd replace both Stoic Rebuttal and Override with probably Render Silent and Counterspell. They're both just going to be more reliable in terms of casting cost.

Both Ghostform and Artful Dodge seem unnecessary. They're one-use spells that only effect a couple of your creatures. Thassa God of the Sea and her ability to make stuff unblockable would seem to be better and more reuseable than either plus you get to scry 1 each turn (really nice) and it's all attached to her big indestructible butt. If you don't have a Thassa or want to buy one I'd say something like Whispersilk Cloak that doubles as removal protection would still be better.

Similar to Ghostform and Artful Dodge, Brainstorm and Thoughtcast are just one-off effects. I myself would prefer a method of card draw that would get me cards repeatedly, ever turn. Righteous Authority is going to repeatedly draw one, plus buff a creature. Rhystic Study would/could draw a TON of cards in mulit-player game. Honden of Seeing Winds gets you one a turn, Mind Unbound gets you one the first turn, two the second, etc. Since you have so many unblockables you could also do combat-damage-card-draw as your method of drawing with Memory Mask or Ophidian Eye or Curiosity or Coastal Piracy. Basically anything resuseable is going to be better than a one-off.

All that said, if you really don't want to run enchantments for whatever reason, then what I would do is run some enchantment hate. You have no real way to deal with enemy enchantments as is, so if you're going to run some of your own I'd find a slot for a least a Return to Dust to kill whatever evil stuff gets cast against you. If you aren't going to run any of your own (or many) why not slot in something like Paraselene to kill everything.

Armed Response is cool in theory, but I guarantee there are times when you just don't have enough equipment in play to deal with that big Traximundar or whatever about to smack your face. I would rather have a Swords to Plowshares or Condemn or Crib Swap or something that has a bit of a downside but will work ever single time (and also will handle indestructible stuff your opponent controls, unlike Armed Response).

I'm not a fan of Terramorphic Expanse or Evolving Wilds in a two color deck. I get that they technically thin your deck, but they do it so insignificantly as to barely make a difference. I'd consider Azorius Chancery or Temple of the False God myself.

Sigil of Sleep is nice with at on of unblockables.

Hanna, Ship's Navigator as one more way to get artifacts back from the graveyard. I'm not entirely sure I would use her, just pointing it out as an option.

I'd run Capsize over Command of Unsummoning, and find a slot for Cyclonic Rift. Nykthos, Shrine to Nyx provides a ton of mana in a mono deck.

Beyond that, looks solid.

I'm guessing Sundial is so you can attack with Kaalia, get a creature in play, and end the turn in case you were attacking an ugly situation. If that's the case, wouldn't Reconnaissance work better at accomplishing the same thing without having to give up the back end of your turn?

Cover of Darkness is pretty rad in Vamp tribal

I ran something very similar for awhile until I got sick of being unable to handle enchantments. It's a fun deck. Cards to consider:

Urborg- I had two friends who ran various landwalk decks, so having a way to remove Swampwalk was pretty useful. If you never see that stuff though it probably isn't worth the two bucks.

Cover of Darkness- Giving all your vamps Fear is pretty useful, especially at that price.

Volt Charge- Nothing super sexy, but I found this to be very versatile. Kill some low toughness creature while you at the same time adding more counters to your vampires that have +1/+1 counters already. Quite honestly I often times found it worth the mana cost just to throw an extra counter onto a Planeswalker when everyone thought they had an extra turn before it was in ult range.

I would guess it's a matter of cost/availability. I should put a Demonic Tutor in all my black Commander decks, too, but it's a lot easier to grab a .25 cent Diabolic from my bulk box than it is to spend another ten bucks on a Demonic :)

Looks mean. Wouldn't want to play against it :)

Child of Night, Ruthless Cullblade, Markov Patrician and Arrogant Bloodlord all seem like creatures who will wind up just being chump blockers 99% of the time. None have flying either and I personally like my vamps to fly :)

I'd replace Devour Flesh with Do or Die. Why make them choose one creature to sacrifice when you can spend the same mana to make them choose half their creatures or more if you split creatively.

You have a couple of one-off "Draw X cards, lose X life" spells. Maybe yank one and put in Phyrexian Arena?

Nykthos, Shrine to Nix gets crazy in a mono-colored deck.

I prefer Subterranean Hangar to Bottomless Vault because you have the option to leave it untapped until right before your turn just in case you need the mana.

Cover of Darkness is an absolute house in vamp tribal.

At just a quick glance the two main things:

1. More ramp to get creatures out faster (and more per turn). I myself prefer artifact ramp and would probably add Sol Ring, Thran Dynamo, Worn Powerstone, Jet Medallion, and probably Gilded Lotus,

2. More ways to protect Anowon. If I see this deck across the table from me I can guarantee that any removal spell I have will be aimed at his head. There's nothing worse than paying five mana for your Commander only to have him eat a Hero's Downfall one turn, then pay seven to have him eat a Swords to Plowshares, then nine to get hit with Beast Within. Lightning Greaves and Swiftfoot Boots are the basic ways to protect, and you could go further with Whispersilk Cloak, Darksteel Armor, Mask of Avacyn and Champion's Helm.

Your land base seems really tight, especially given the lack of ramp. Even mono-white I personally wouldn't run less than 35. YMMV there though.

Emeria, the Sky Ruin and Temple of the False God are both very useful in mono-white. Homeward Path feels a must-have in Avacyn, because there is NOTHING worse than having her taken from you. Swinging from having a 8/8 flyer and all your stuff be indestructible to having it all be killable as you face an 8/8 flyer whose makes all your opponents stuff indestructible is bad news.

To supplement Homeward Path I'd consider a utility card or two that gets her back as well. Galepowder Mage sdoes double duty letting you kick a blocker out of the way on attack or letting you exile a stolen creature and get it back. Stonecloaker is nice for repeatable graveyard hate and can be used to bounce Avacyn back if need be, and Ghostway doubles as a method to get her back or save all your stuff in event of a board wipe.

Not sure if it fits, but I like Crackdown in mono-white.

I'd just generally consider having a lot more board wipes. Wiping the board when all your stuff is indestructible is pretty great.

Adarkar Valkyrie and Karmic Guide would be nice too as they get other angels back into play. Thematically Mask of Avacyn also fits, and it helps keep an important beater alive.

Maybe Ivory Tower over Golden Urn?

Thematically you probably want Entreat the Angels.

Do you really think that's going to happen, though? Your commander costs 6 to cast, you have little ways to ramp to him, no way to protect him, and everyone sitting at the table with you is going to know that the second he hits the board 1/3 of the cards in their own decks are going to deal 6 damage each time they cast them. Do you think you're ever going to be allowed by those people to be in a position to play your commander, have him live, and then play a bunch of creatures? You wouldn't be allowed to in my meta, and we're not even that competitive. A guy plays a deck entirely based on pirates if that's any indication. I mean I could build a deck with 50 Shadowborn Apostles and 10 demons, and if I'm playing against nobody that looks like a great deck, but no actual players are going to let me do that.

YMMV, though. Good luck with it.

The upkeep in this case is a relic. At one point in time any mana you had in your mana pool that you didn't use hit you for a point of damage each when not used. So originally Braid would give you mana in increasing amounts each turn that you had to spend or you took damage.

Now that unused mana doesn't hurt you anymore it's just free ramp.

Cards to consider:

Artifacts: Black Vise, Teferi's Puzzle Box
Creatures: Kami of the Crescent Moon, Nin the Pain Artist, Psychosis Crawler, Robber Fly, Shah of Naar Isle, Shocker
Enchantment: Phyrexian Tyrrany
Instant: Wheel and Deal
Sorcery: Braingeyser, Diminishing Returns, Invoke the Firemind, Mind Spring, Minds Aglow, Reforge the Soul, Time Reversal, Windfall, Winds of Change

This. Amazing card.

Citanul Flute is really useful with that many low-cost elves. Yeah, it costs four to cast, but after that you can basically tutor up a low CMC elves. You don't have much card draw so that might be helpful.

I'd also replace Naturalize and maybe Artisan's Scorn/Oxidize with Deglamer and Fade Into Antiquity so you can have it deal with Theros Gods or Darksteel stuff. I see a ton of Gods and being able to tuck them or exile them is invaluable.

Okina, Temple to the Grandfathers isn't amazing, but it's cheap, doesn't come into play tapped, and once in awhile it can make a difference. Same with Pendlehaven. Nykthos, Shrine to Nyx can provide a ton of mana in a mono deck.

Kaysa is nice in mono-elves.

Disenchant won't hit Theros Gods or other indestructibles like Darksteel Plate, Forge, etc. I'd swap it for Revoke Existence. It may not matter for your meta I suppose, but I personally see SOOOO many Theros gods and Darksteel stuff that I can't run things that don't exile or tuck.

Invisibility might be better replaced with Aqueous Form.