Oblivion Ring, Banishing Light, and Replenish are all good cards for the deck, but each has been forced out by newer, more powerful versions.

Abundance, Ethereal Armor, Stony Silence, and Suppression Field are fighting to get in.

Abundance, Ethereal Armor, and Suppression Field would all be good fits.

City of Solitude is another silver-bullet enchantment that could go in. A more defensive build could run Luminarch Ascension and Sphere of Safety effects.

I dig the build. I was pushing towards a similar cantrip theme, but decided I'd rather do large draws all at once a la Hunter's Insight and such

Mind giving me a little feedback on my own? Uril Naya Enchantress

Add a savage ventmaw in it. With him and Aggravated Assault you get unlimited combat steps

@SocialConstruct: Thanks for the comment; I'll happily give feedback on your list, I've just got to find the time. I've played with the damage-draw and power-draw cards in earlier builds, and found that while they have the potential for drawing giant chunks of cards at once, they suffer five main flaws:

A) You can't play any auras you draw on Uril pre-combat to boost his power with the damage-draws (Hunter's Insight; Hunter's Prowess)

B) You have to have Uril on the battlefield. Not all that hard, but those times after a Final Judgment and its ilk are often the best times to reload your hand, and you can't efectively do that until Uril's back online.

C) You have to actually draw the draw spells (Hunter's Insight, Soul's Majesty, Hunter's Prowess, Garruk, Primal Hunter), of which there are fewer than cantripping enchantments

D) Some players and/or playgroups commonly 'spite-scoop.' If Uril is attacking Player Z for lethal, and you've cast a Hunter's Prowess during your first main, then Player Z can concede after attackers are declared-- but before damage-- meaning that you won't get to draw your cards

E) It's not uncommon for Uril to have > 11 power, and even if you have Mirari's Wake out, you can't cast all the cards you draw. Discarding isn't a huge deal, and cards like Retether can benefit from a stocked graveyard, but it's still worse than casting all your spells. The cantripping enchantments can be cast on enchantresses if necessary, and your opponents can't really stop them. They cost less, while also pumping Uril which is nice. Plus, they provide a slower, steadier stream of cards, which I've found to be more valuable in EDH. Hopefully that provides some insight.

@DPrice25: Savage Ventmaw does combo well with Aggravated Assault, but it doesn't do particularly much outside of that. He has no protection, has to survive a turn before attacking, has to survive the attack, and can only be tutored with Defense of the Heart. Bear Umbra can be tutored with far more cards, is an aura, and protects Uril as well. The 'combo' is nifty, but I'd caution against going all-in on it, as there are too many ways for it to be derailed versus other combos. While Uril appreciates extra attack steps, they aren't crucial to pulling out a win.