If you have the Serpent maybe try out Dauri, LM, Chojuro and maybe Hinata. If you don't have the Serpent maybe Dauri, LM, Chojuro and Neji. I have not tested them myself but I think it will work til you get more rares.

If you get Mei next, try out Chojuro, Mei and Ao with the water main. I'm doing great with that team.