Mulligans
General Mulligans
Your early game needs to be strong to keep up because of the poor card draw. Mecharoo into Fireworks Tech can make a decent aggressive board, while Tracking and Ursatron are essentially your card draw. If possible, Fireworks Tech should target a Goblin Bomb unless the +1/+1 or Deathrattle trigger is better elsewhere, but both are usually ideal for the Bombs in most situations. Boommaster is a runner up for for mulligan target as he's one of few non-Mechs, and perhaps Necromechanic.
Taking my Goblin Bomb Hunter into the Year of the Dragon with an overhaul. Ursatron replaced Stitched Trackers, reduced Necromechanic and Wargear to 1s to make room for Safeguards. Whirlglider and some rotated cards made way for new Deathrattle Mech support and a pulled Mecha’Thun. Missile Venomizer was frequent enough and made for great board clear, so other shouldn’t be required. Debating Mechanical Whelp.