I love the idea of soulbound and think it's quite more powerful than it appears. If I would give you some advice, I'd try to emphasyze the paper of Champion of Lambholt. If it gets paired with Wolfir all your guys become unblockable; that's not to underestimate. I'd personally run 4, maybe cutting out a Fiend Hunter and the Peddlers. I know they combo well when blocking, but really, do you want to block in this deck? Or rather using Silverblade Paladin and whoever is paired with him to kick your opponent's ass? This is something you need to consider. I'd add two lands aswell -I know you produce mana with birds and pilgrim, but you want to be dropping your 3r land on your 3rd turn to have Wolfir Silverheart or Restoration appear as soon as possible. My changes would be:

-3 Nightshade Peddler-1 Craterhoof (sure ends games but way too costed)-1/2 Fiend Hunter-2 Nearheath Pilgrim (in my version, you don't want to gain life. You just want to beat 'em hard. They are really good sideboard option though, against hard aggro decks)

+2 Kessig Wolf Run (considered pumping Lambholt? not a bad idea)+2 Champion of Lambholt +4 Strangleroot Geist (cuz they are just amazing!)

Some really great thoughts, they are echoing what I have been thinking myself. Just put the deck together in its present form so let me play test some before I commit to any changes.