Looking at the online card list (
http://farwilds.110mb.com/cardlist.htm) it appears that there is a big disparity between domains/races regarding resource buildings (building which give domain). For example Dark Legion has 3 buildings which give domain and are common while Mountainfolk has only 1. This is a huge disadvantage for Mountainfolk players and may be one of the reasons why there are so many Dark Legion and Elemental decks now.
I would suggest that this needs to be addressed in order to make the races more balanced. A couple of suggestions would be:
1) Eliminate the 3 card rule
*only* for the Domain/Base buildings that every race has. This would mean that a Mountainfolk player could have 4+ Dwarven Halls but still only 3 or less Heart of Mountains.
or (less desireable)
2) All races should have the same number of common and uncommon buildings which provide domain (and probably are bases as well).
I am experiencing this now as I have plenty of cards to make a Mountainfolk deck but I only have Dwarven Halls and 1 Heart of Mountain so in order to make a playable deck I need Blueprints, Pantheons or Astridian Diplomats.
Dark Legion:
Graveyard - Common
Altar of Ix - Common
Bone Fortress - Common
Mountain Folk:
Dwarven Hall - Common
Blueprint Spell - Common
Heart of the Mountain - Uncommon
Hadarck's Throne - Rare
Sylvan:
Grove - Common
Great Oak - Common
Elemental:
Magma Chamber - Common
Vapor Mahal - Common
Thunderhead Reach - Uncommon
* Sphere of Radiance (requires ability use) - Uncommon