Revolutionary Flame (Standard)

Trying this out in the Magic Arena beta (hence the extremely low land count since they have a weird shuffler for Bo1). You always want at least 2 lands in your starting hand and thanks to The Flame of Keld, going to 6, 5 or even 4 isn't as punishing as you'd expect. Bomat Courier also helps us refill our hands fairly soon.

The deck tries to use Pia's Revolution ability to the max, meaning that any artifact is basically a bolt to the opponent's face and if they decide to let you recur it, Reckless Fireweaver does the job a bit slower. With both in play, each Walking Ballista turns into 4 damage for 0 mana (if they don't take 3 from the revolution you simply keep casting for X=0 and ping for even more). The Flame of Keld also affects both the fireweaver and the revolution.

The Ornithopters are good blockers or sac folder for Ravenous Intruder, the same goes for Servo Schematic. Foundry inspectors let us dump our hands more easily and Scrap Trawlers let us recur a good amount of artifacts from the graveyard if used wisely.

About the sideboard: WIP. Not 100% confident on it since I've been testing the deck in Bo1 and Bo3 seems to use a different shuffler, but it should work.
The hardest matchups are always Mono-R aggro and UW control, so my picks were to fight fire with fire (bring in shocks, sprays and abrades against aggro) and try to race control with more creatures (Scrapheap Scrounger and the rest of the Ravenous Intruders). 1 Swamp in the side to go with the scrounger (you can fetch it with the maps/amulet).