With only 40 energy from a refill, I got 8 werebeasts and another partial. That's really quite doable.
Lining up barracks and haunted castle to have energy dropping adventures ready day 7, and three elixirs ready to prepare. If you have wizard schools, all the better. That alone should make 50 also doable with just 3 energy resets. Visit neighbors and watch ads to make it if you're a little short.