Mulligans
Aggro Mulligans
Get your rexxar to clear and shaw to turn your flanking strikes into multishots, keleseth buffs your stuff, and cube-play dead your eggs and steambots
Control Mulligans
Play out eggs and things against decks with a lot of clears, it will discourage them from playing their clears
Magnet to your mechs and play dead them for more and more value. Cube Steambot and clone it a bunch of times.
Obviously, replace the Demolisher, Meat Wagon, and Harvest golem for better mechs as they come.