I seriously wish there were some Thunder related cards, like a Thunder Sword, dealing like 3 Damage and also having a chance to "Stun" an enemy, skipping their next turn.
Fun fact, in the original demo there were quite a few cards that "stunned" the enemy, but playtesting showed that it was much too powerful to be able to stop an enemy attacking so easily. I do like the idea of "Thunder" cards though, but might need to have some different effect