I have been trying to make a Rasa team as well but the best team so far I found is this

Naruto (Sage mode), Rasa, Mabui, Wind main

Main skills: 3,4,1,2,3 Summon:Lightning tiger king

The team has good control, high chakara production, well sustainability.

Side effects: Useless team after round 4, Weak against immune state enemies, Can be destroyed by any chakara *ing skills from enemy team.

Other wise this team is dominating and can save you from many bad situations by Rasa ult so make sure he is on position 1, Mabui position 2, Naruto (sage mode) behind Rasa to summon his clone to protect him.