Mulligans
General Mulligans
You really really need to get 1 void ripper into your hand before you recruit, as recruiting both void rippers will destroy your win condition. Ramping is always good as you can start putting out the big taunts early. Oaken summons is very powerful, you will want ironwood golem or astral tiger on the board to start clearing their 3 drops. There aren't many ways to recover here if you lose the board.
Aggro Mulligans
For aggro, you probably will survive just by gaining health and having so many taunts. Early aggression can be dealt with by fishing for these cards when you mulligan.
This is a deck I thought up while watching the next card reveals and wanting to use some new cards that saw almost no play last cycle like Astral Tiger and Hadronox and also a few of the new cards like Witchwood Grizzly and Rotten Applebaum.
The goal here is to outlast and cast lots of high health minions, especially witchwood grizzly, or witchwood grizzly copies using Witching Hour. If you have enough high health taunts on the board, then use Void Ripper to surprise OTK them. This deck will be very board control focused, efficient trades will be important.