1) Not sure if Sorrin is a good fit. The agressiveness of the deck can be accomplished using other creatures on top of tokens;
The Lingering Souls are simply excellent for extrort beyond their other synergies, where Sorrin isn't.

2) Brave the Elements would be very powerful in this deck, but I like the options for going beyond mono white, creature-wise.

3) Path of Bravery is also an obvious, powerful addition to this deck, but it may only see use part of the time. Therefore, I only included one.

4) This deck may also be trying to do too much. I dont think the Unburial Rites are really necessary.