UPDATE: The buff to Patriarch really pushed this deck into T1 territory IMO. It's fun, it's effective, and it has the ability to beat almost every boss. Unlike most other decks I've tried, this is actually able to win most games against high-level master rank AI decks.
There's probably some room for improvement, or preference, especially in the market. There's also probably a way to trim down the number of 3-drops, but Initiate>Avirax/Patriarch>Ila & Mizo/Behemoth is pretty common and strong, and Evelina + Kimi is ridiculous. Hatchling is mostly there as market fodder and flying chump.
Market is removal, endurance, killer for Ila or Behemoth, Berserk to push through damage with a flyer/overwhelm unit or let Ila copy itself in a single turn, and pit for those rare games where you get into a topdeck or board stall state.