One of the early front-runners for best Beast Druid build is this Justsaiyan Beast Druid w Menagerie Warden The Curator Onyxia. He posted on his Twitter getting off to a 17-3 start.
The lack of card draw that holds some other builds back is solved with the draw from The Curator. You pull Onyxia and a Beast to fill out your curve if you don’t already have the cards in hand.
This list also includes Wild Growth so you can ramp up early and get to your Menagerie Warden combo sooner. 🙂