I tried to bulk out the lower end of the creature curve and include one broad utility spell for each color. I'll see how it works and adjust from there.

Double Faced Cards
Village Ironsmith
Villagers of Estwald

Commons
Ambush Viper
Ashmouth Hound
Avacyn's Pilgrim
Blazing Torch
Bloodcrazed Neonate
Cobbled Wings
Crossway Vampire
Darkthicket Wolf
Deranged Assistant
Doomed Traveler
Elder Cathar
Feral Ridgewolf
Geistflame
Ghoulcaller's Bell
Ghoulcaller's Chant
Ghoulraiser
Kessig Wolf
Markov Patrician
Moon Heron
Orchard Spirit
Ranger's Guile
Selfless Cathar
Selhoff Occultist
Silent Departure
Silverchase Fox
Spare from Evil
Stitched Drake
Stitcher's Apprentice
Traveler's Amulet
Typhoid Rats
Unruly Mob
Vampire Interloper
Walking Corpse
Wooden Stake