Here's my idea for some cards that could be added in a future update.

Kuki Shinobu (1 cost uncommon power) Gain 3 (4) regen, at the end of your turn deal 5 (7) damage to all enemies and apply electro to them.

Amber (1 cost common skill) gain 5 (8) temp hp. then gain Baron Bunny buff that at the end of 2 turns or when you lose all your temp hp will explode dealing 12 (16) damage to all enemies and apply pyro to them.

neuvillette (2 cost common attack) deal 4 (5) damage to all enemies 3 times and apply hydro to them after each hit.

wriothesley (1 cost uncommon attack) Deal 8 (11) damage, apply cryo to the enemy, gain 5 (8) temp hp.