This is a white enchantment control deck (see title). It functions to slow down the opponent's deck and control the board until Luminarch Ascension or Sigil of the Empty Throne can get active, at which point the game is typically won in a matter of a few turns. If adjustments were to be made, I'd highly suggest the addition of Serra's Sanctum (more money than I'd like to drop on a single set of cards). Also, I've toyed with the idea of putting in Enduring Ideal: so if you want to tinker with that, be my guest (and please tell me how that went?). If you have any suggestions for better toolbox enchantments or more synergistic enchantment combinations (like humility/reverence), please comment below. Additionally, I'm unsure as to whether the Enchanted Evening/Arenson's Aura is main-deck worthy, so opinions on that would be appreciated. Thanks!
Main-deck Notes/Card Interactions:
The Humility/Reverence is a nifty combo that, if you can get out, can be highly valuable. Porphyry Nodes is best used after the opponent has 2 creatures out (or if you want, you can play it after one: however, playing it at the three creature-count is risky, as the nodes won't be able to eliminate them fast enough before they can put serious dents into your life total). By doing this, the opponent will either have to slow down and wait for a creature drop, or will give you IMMENSE card advantage by trying to push through it (this will allow the nodes to kill multiple creatures at only one mana). Nodes will play excellently with Mobilization, since you can continually place enough soldiers on the board so that you don't have to sacrifice the nodes, though even if you let it get sacrificed after one kill, it will be a cheap kill-spell at only one white mana.
The idyllic tutor functions as a sort of toolbox tutor rather than trying for a specific piece. For example, if there's only one creature threat, then it can fetch for a pacifism. If that creature's ability is what is dealing damage/destroying your enchantments/etc, you can fetch the fetters. If there's multiple creatures, then planar collapse will board-wipe. As an aside, for those who are unsure, enchant creature spells placed on your opponent's creatures still count as "your" enchantments: this is an important consideration when counting for the Sphere of Safety or if Greater Auramancy is in play.
Endless Horizons allows for you to increase your top-deck capability in the deck: by essentially guaranteeing every draw is going to be an enchantment (minus the tutor, which will get you an enchantment), the potency of the Sigil of the Empty Throne is greatly increased.
Side-boarding Notes:
This deck functions best against creature-based decks: in other cases (such as other creature-less, control decks, combo decks, etc), Arenson's Aura, Enchanted Evening, and Equipoise will help. By making everything enchantments, you can use your lands to destroy crafty artifact threats and/or eliminate their land-base; equipoise will limit what the opponent can do during your turn, as it will phase out all of their creatures (generally) and a few of their lands (be wary of using equipoise if you play against a deck featuring a lot of CIP effects or if you've placed pacifisms on their side of the board... that's why it's a better card situationally and thereby in the sideboard). Extra Ghostly Prisons/Planar Cleansing are best used against faster aggro decks, where the more effective (generally) Sphere won't ever see the light of day.