Best Countess Decks
Countess' main objective is to take out weak units with her Super. Pairing her up with tanks and high-damage Minis will be a great way for her to KO the whole team. And since she already heals herself, you won't need to worry too much about having healers as she's moving along.
One difficult item to note, however, is her low HP at the start. Providing a good distraction will be key to unlocking her full potential. So having Minis like Knight, where he can force enemies to attack him, will be a good way for Countess to get enough energy at the beginning of the round.