Kinda OP. My feedback:
Elven Archer - would need a higher minimum (at least 5), or 1 less damage. Since the bonus is -1 opp power and damage, you have a DR every round, and they have to beat your card spending more pillz. Poison can be a very dangerous ability with this clan bonus.
Dark Wizard - has solid stats, and an overpowering ability which can be used almost any round. Combined with his bonus, he's a bit too fierce. Either -2 pillz, min 2/3, or a 7/4
Elven Queen - Unopposed, she's a 7/7 that stops both abilities, bonuses, and has -1 opp power and damage. Too OP, even if conditional. She needs 8/5 or 7/6 stats, with SoA OR SoB
Elf Warrior - Kinda balanced. If the others in the clan stay as OP as they are, needs to be changed into a 7/3, or drop the Stop ability to +8 atk.
Elf Druid - Pretty balanced. I'd say keep him as is, but looking at Manfred
... Maybe 7/4 or 8/4 + conditional would be balanced.
Dwarf King - A very hard hitter. Even at 6 power, with the bonus can bring things to his lvl, or slightly lower. Pretty fair, but on the stronger side of fair.
Dwarf Brawler - Way too OP. 5 damage is very good for a 3* and you're giving an ability that can boost to 7 damage. Even with 6 power (which is still passable, especially for a 3*), the bonus can brings things down 1 power. How to balance this one? Make the ability Confidence or Courage, and -1 damage. Possibly +1 power, if those two are changed.