Hearthpwn

I did the craft. Fairly pleased so far. 

Not sure what I'm aiming for in the opening hand, though. I keep wild growth, of course, but should I also hold Avi and Kun if they show up? I have been. Do you want to burn the 1-mana damage spell on turn 1 to get treants? 

Is there a good streamer who plays (recently played) this?

Thanks for your recommendations thus far! 

muligan for ramp and card draw , never keep expensive combo pieces

In your opening hand you want Wild Growth, Oaken Summons and potentially Wrath as a general starting point.

Against aggressive decks keeping onto a Swipe or a Spreading Plague is often correct but never both of them together.

Against slower decks, cards like Nourish are decent enough to keep.

I've played this deck for multiple seasons and I can say that although there are some key cards that you always want like Wild Growth, the Mulligan changes a lot depending on the deck you are up against. Case and point against Mill rogue you want to keep your combo pieces in hand (although this is the only match-up you want to do something like that) and almost never draw your own deck. 

Hope this helps. :)