Hi Fluffpocalypse,

Uril is awesome and I think you've done a good job on this deck. I have some ideas to make it even better. I am not sure whether you are on a budget; judging from some of the cards you have already chosen I rather doubt it. Anyway, these are some of the cards I think could prove useful:

Lands

1. Contested Cliffs; use this to take out any annoying creature you want, without having to tap Uril.
2. Kessig Wolf Run; to temporarily give Uril +X/+0 and trample, very handy.
3. Rogue's Passage; make Uril unblockable. Useful in case your opponents are waiting for him with deathtouch-creatures.
4. Sunhome, Fortress of the Legion; to temporarily give Uril double-strike, in case he does not have it already.
5. Slayers' Stronghold; boost Uril with vigilance, haste and +2/+0 for ? Fantastic!

Creatures

1. Grand Abolisher; wonderful creature to counteract counter-magic.
2. Mirri, Weatherlight Duelist; as long as she can attack, shes an extremely useful creature in a voltron setup.
3. Sigarda, Host of Herons; second Tajuru Preserver and a powerful creature too.
4. Xenagos, God of Revels; combined with an enchanted Uril, powerful enough to end games.

Instants

1. Boros Charm; especially the last two abilities of this spell will prove useful in your deck.
2. Path to Exile; because a deck without counter spells AND point-removal is bound for trouble.
3. Swords to Plowshares; see 2.
4. Temur Battle Rage; nice, cheap way to suddenly boost Uril significantly.

Sorceries

1. Chandra's Ignition; this can win you the game in lots of cases.
2. Open the Armory; great aura-tutor.
3. Three Dreams; another great aura tutor.
4. Winds of Rath; this card seems made for a deck like this.

Enchantments

1. Blessing of the Nephilim; rather cheap way to give Uril +5/+5.
2. Daybreak Coronet; not a cheap card to buy, but in this deck its so powerful it's almost insane.
3. Dust Corona; cheap to cast, with a nice bonus and a blockers restriction attached.
4. Madcap Skills; a bit like Dust Corona, cheap, good bonus and a blockers restriction.
5. Sphere of Safety; with so many enchantments on your side, attacking you becomes rather costly.
6. Spirit Mantle; cheap way to make Uril unblockable.

Some cards I would remove from your deck to make a little room:

1. Angelic Skirmisher; expensive to cast, not worth it considering you are running very few creatures. Uril has cheaper ways available to him to get these bonuses.
2. Blazing Archon; extremely expensive to cast, there are much cheaper ways to prevent attacks (see suggested cards).
3. Akroma's Memorial; expensive to cast; would be more useful in a deck that contained many (token) creatures.
4. Razia's Purification; I would replace this with Winds of Rath.

Hopefully you feel some of this is useful. I wish you lots of fun with this deck; let us know how it plays! Also, I would appreciate some feedback on one of my decks, if you have the time. Thanks!