Looking at this again, your mana curve is sitting pretty at 3, with plenty of cards that take double colored mana (I counted 11, without looking at anybody's abilities). Maybe you should throw in a few Manaliths, Traveler's Amulets, or Obelisk of Nayas? (The Obelisk is a quarter on troll and toad, and 57 cents on amazon.) If you need room, you could always get rid of the Blood Feud (Too expensive for a simple removal, especially in a tri-color deck. If you really need the effect, maybe an Uvenwald Tracker could work instead?) or Blasphemous Act (A world burn in a creature deck? That'll hurt you more than your opponent.) Heck, if you just want more creatures, Borderland Ranger does the job nicely, too.