Some interesting (unbalanced) cards:
Traders Guild (uncommon/7G 7R)
Discard a card from your hand
If the card is a rare card +9 Stock
If the card is an uncommon card +7 Stock
If the card is a common card +4 Stock
Slavery (common zero)
-75% of your recruits
Stock + 50% of destroyed recruits
(for example: you have got 10R, 7R are after this card destroyed, so you’ll get 4 Stock)
Soul harvesting (9R/9G/9B uncommon)
Transfer 50% of enemy recruits into gems. (The 50% of enemy recruits are destroyed)
Blood mage (uncommon 12R 14G mage)
Attack: 13+50% of enemy recruits (The ½ of enemy recruits are destroyed)
Rush (common zero)
Discard all common barbarian, soldier and brigand cards
Attack: 2x # of discarded cards