Mulligans
General Mulligans
A great hand would be Mecharoo, Fireworks Tech and any other card (like ursatron or Whirlglider)
If you do have Mecharoo and Firework Tech in your starting hand, you can turn 1 drop mecharoo and turn 2 drop Firework Tech. You'll have a decent tempo play at just turn 2. If you don't have have one or neither of these cards, you can turn 2 Ursatron (assuming you have the coin)
Mech hunter is a great deck in today’s meta with a high percentage winrate in ladder.
Although with the absence of Zilliax, Leeroy Jenkins or Boommaster Flark, this deck is still great.
If you do have Zilliax or Leeroy Jenkins or both, you can swap out Safeguard or Bronze Gatekeeper.