Giving him indestructibility makes him pretty much unkillable barring enchant removal, but that means your opponent has to set up in order to kill Uril, (first getting the Indestructibility and then Uril, he's gotta get two cards set up, and that's assuming theres not anything else worthy to target.)
I wouldn't say the avatar hybrid enchantments are bad. Imo, they are pretty good for their cost and are worth risking being 2-for-1'd.
And with Indestructibility, it'll most likely be at least 2 for 2, if not more.
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Started playing since Invasion, stopped at Scourge. Returned briefly during BoK's introduction of ninjas. Finally back into magic during Shadowmoor/Eventide.
Currently Running Bant Control and a homebrew Blightning Echoes for Type 2.