I have tried to find ways of using the fang pi and like you, I find it difficult. But Roots are pretty nice. Use Ratanah, Noodile, Yookie and Narendra. That's 13 stars worth of characters, and their bonus kills people using graksmxxt/Vermyn N/copper. Use the Roots along side with La Junta to give your deck a boost in your damage dealing abilities.