you will eventually get him for free in sage treasure.

For a while i used this lineup:

Yagura Sage Naruto Roshi

Azure Fang x x

x x x

talents: 32322 or 32432, summon dog of hell. works quite good.

another one i tried for fun that seems to work not bad is:

x Sage Naruto Gaara (normal)

Kushina Crimson Fist x

x x x

talents: 33222, summon: rhino