Over a year has passed, and during the MTGA downtime I played some Duels.
Updated the OP with a Rakdos Midrange list I've used. Building it I leaned with the Rakdos lists that menaced the DOM Standard, this is what came of it:
Creatures (23):
2 x
Walking Ballista3 x
Inventor's Apprentice2 x
Bomat Courier2 x
Glint-Sleeve Siphoner2 x
Kari Zev, Skyship Raider2 x
Scrapheap Scrounger3 x
Ahn-Crop Crasher2 x
Pia Nalaar1 x
Hazoret the Fervent2 x
Pia and Kiran Nalaar2 x
GlorybringerNon-creature spells (12):
3 x
Fatal Push1 x
Heart of Kiran2 x
Smuggler's Copter2 x
Cut // Ribbons3 x
Unlicensed Disintegration1 x
Chandra, Torch of DefianceLands(25):
1 x
Swamp9 x
Mountain2 x
Smoldering Marsh2 x
Dragonskull Summit3 x
Aether Hub4 x
Evolving Wilds4 x
Cinder BarrensFeels very strong overall. Notable omissions are
Dread Wanderer (entering tapped doesn't do the deck any favors),
Abbot of Keral Keep (no room, plus the deck might be a tad too high on average CMC for him),
Harnessed Lightning (the other 8 removal spells in the deck are better fits IMO and I don't want to overload) and
Akoum Firebird (mostly because of the bug with it, but there is not really much room for it either).