For a while I was afraid blurple was not possible anymore, but finally got a list that clicked for me. It carried me through the last Mythril ranks to Champion (20-8 record). It's an aggressive list that wants to control the board, make value trades and snowball the board advantage quickly. Basically it has cards that excel at value trading (Shinobi of Smoke, Thane, Godsblud), and uses buffs (Smith (thanks Lonk!), Juiced and ACC) with mend. Some overrun is there in order to be able to close out games.
The boots from the Hireling are great on Smoke for the obvious swift and getting it out of Magmataur range. It feeds into a larger swift/movement strategy though (with Scout, Sniffer, Juiced) that allows to control the board through minions. An often used strategy that won me various games is to double dip (or even triple dip!) on the Demolition Speedway using the movement options. Not often happening but theoretically there: the created cards from Primeval Son and Koxinga nicely combine into instant removal.