Are there any easy-to-farm nat 2* mons that we should be using for Titan Clan battles?

Need some help filling out teams to be more affective for my clan. I think I'm definitely lacking healers, but not sure if there's other nat 2* that would be good debuffers?

If I don't have a nat 3* or 4* healer available, should I be dropping in Fire Bellpups for fire teams and Water Cotteens for water teams? Any good one for wood?