Personally I would avoid 4* Roots, as all of them are mediocre at best and aren't really that strong. I would actually do Amanie to Noodile, and Arno to Yookie. Why? There will be a ton of other Roots decks out there and you won't want low powered cards against them. Also, if you have the money to get a Shakra, then by all means do so. Otherwise I would just go with what I suggested.