Mulligans
There’s a lot of card draw in this deck, aiming to obtain every combo piece. Most of the time, you will win by gaining control over the board, but against more control matchups like the new priest, you will need to keep the OTK as a backup plan.
There are deathrattle synergies with Pack Tactics, Mok'Nathal Lion to multiply the effect of all the deathrattle in the deck that draw a card, or Zixor, Apex Predator to add an op card into your deck. There are secret synergie with Phase Stalker and the secret package. There is rush synergies with Diving Gryphon that draws your rush cards. Most importantly, there’s the beast synergies with the tutor Scavenger's Ingenuity and the removal Scrap Shot.
You can set up the otk with Scavenger's Ingenuity if it draws King Krush, or use Scrap Shot with only the King in hand. Then play two Ramkahen Wildtamer to copy King Krush and finally play Beastmaster Leoroxx with the three Kings in hand, and aim for the face. You can clear up all the annoying enemy taunts with Zixor Prime ( + if he’s buffed ).
Again, against aggro/midrange decks you should play Ramkahen Wildtamer and Scrap Shot on curve and not wait for the combo. Beastmaster Leoroxx then becomes a great tempo swing, especially if you have King Krush in hand.