Perhaps swap out one of the seals for an Aura of Silence?

Whispersilk Cloak also, while strong in its own right, gives Uril shroud, which means you cannot further enchant him with anything. Kinda risky, especially considering Uril already essentially has hexproof written on him.

WHY YOU NO RUN Rogue's Passage!?

Enchantment based awesomeness: Helm of the Gods, Sphere of Safety, and Sage's Reverie

Enchantment draw: Kor Spiritdancer, Eidolon of Blossoms, Plea for Guidance (it's close)

Protection: Asceticism and Privileged Position.

Enchantment recursion: Sun Titan, Retether, Open the Vaults, and Replenish

Good enchantments (Uril boosts himself, so the enchantments must be either evasion or flipping awesome): Angelic Destiny, Unflinching Courage, Hyena Umbra (first strike and totem), Battle Mastery, Holy Mantle.

I suggested a lot of cards, but you need to take stuff out. Just move out cards that are strictly worse, but try to remove cards of the same mana cost.

Ooo! I forgot. Sterling Grove is also pretty stronk.

Thank you very much all, you've given me a ton of helpful advice and lots to work with.