Agreed, Lingering Souls saves lives.
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I think Sorin, Lord of Innistrad would work better with Sigil.
Balefire Liege, Balefire Liege right now!
Path of Bravery is a great enchantment to have when you attack with a hoard. I run it with my boros and always find it a great way not only to gain life but also power up your whole army, seeing how you're already ahead on life with the current setup.
Don't get me wrong, I love this deck. But to me, no dragon deck is complete without an Utvara Hellkite and/ or Braid of Fire. They let you play dragons like nobody's business.