I've been using Valk leads with Valk, Siren, Echidna, and CoC Healer. All max skill.
With another max skill valk ally I have 3 heartbreakers on a 5 turn cool down, Red to heart and dark to heart on 5 turn cool downs, Echidna on a 10 turn. Hp is usually around 12k. Most floors I just sweep...