I'd been bored with this standard for a while, but stumbled on this Rakdos Powerstone list that top 8'd recently and its a lot of fun, while putting up results.
Deck
4 Automated Artificer
4 Bloodthirsty Adversary
4 Thran Spider
3 Phyrexian Fleshgorger
4 Cityscape Leveler
3 Go for the Throat
3 Sheoldred's Edict
4 Gix's Caress
2 Excavation Explosion
3 The Mightstone and Weakstone
1 Portal to Phyrexia
2 Mountain
2 Swamp
4 Sulfurous Springs
1 Battlefield Forge
1 Caves of Koilos
4 Blackcleave Cliffs
4 Haunted Ridge
1 Shattered Sanctum
1 Sundown Pass
2 Mirrex
1 Sokenzan, Crucible of Defiance
2 Takenuma, Abandoned Mire
I'm playing a lot of different stuff in Standard, but this might be the most interesting list. It's a blue-white poison deck that kind of plays like a burn deck. I found it on magic.gg a couple of weeks ago and tweaked it.
Your opening hand has to be able to cast a Skrelv, Chorus, or Prologue, because those are the only ways to assign the first poison counter.
Serum Snare is one of the best cards in the deck. Bouncing a three-drop can buy you a lot of tempo. Also, in the late game, Arcane Proxy to flash back Serum Snare targeting the Proxy itself is a pretty good play.
The sideboard mostly seems intent on beating mono-red, and I sympathize with that goal so I didn't change it much. I did once get to discard an Obstinate Baloth to Liliana, which was pretty fun, but I ended up taking out the Baloths for a couple of Skrelv's Hives, which I'm hoping will provide a little more late-game viability against control decks. Might find room for a third copy.
I will say that this probably doesn't beat the blue-black proliferate deck, because they're trying to do the same thing you are but they have real permanents. I faced it once and it wasn't a close game.