Mulligans
This deck rilies on the new interaction between Naga Sea Witch and the Giants.
If you can get a discount of 5 on the giants, once you played the naga the giants cost zero. Therefore the goal is to survive until you can set up a Naga / Giant turn.
King's Elekk and Stiched Tracker are used to get missing pieces to the hand.
Mad Scientist helps pull out Freezing Trap wich also help your Clockwork Giant .
Tracking can be used to dig through your Deck.
The rest is for protection against aggro and Call of the Wild is another (cheap if combined with naga) finisher.