Some more ideas on how to approach Pioneer differently.

One of my favorite cards from recent years was [scryfall]Inverter of Truth[/scryfall]. It’s hard to use, but who cares? The idea here is to control the board with burn, until you are ready to turn the game, and then play the Inverter, leaving your library (hopefully) just full of burn.

[deck]
[creatures]
2 Zurgo, the Bellringer
3 Ghitu Lavarunner
4 Runaway Steam-Kin
4 Forerunner of Slaughter
2 Olivia, Mobilized for War
4 Inverter of Truth
[/creatures]
[spells]
4 Shock
4 Lightning Strike
4 Slaying Fire
3 Collective Defiance
4 Skewer the Critics
[/spells]
[lands]
4 Blood Crypt
4 Dragonskull Summit
4 Foreboding Ruins
4 Mana Confluence
4 Mountain
2 Swamp
[/lands]
[/deck]

The mana is horrible here, as you need triple red for [scryfall]Slaying Fire[/scryfall] and double black for the Inverter. Sometimes you will probably just lose to the damage from your own lands.

How about tribes? There have been several good ones over the years in Standard. Humans, Zombies and Knights come to mind, but even Elves, Goblins and Merfolk have been at least marginally playable. And then there’s Wizards.

[deck]
[creatures]
4 Soul-Scar Mage
4 Ghitu Lavarunner
4 Burning Prophet
4 Stormchaser Mage
4 Adeliz, the Cinder Wind
[/creatures]
[spells]
4 Opt
4 Expedite
4 Crash Through
4 Renegade Tactics
4 Shock
[/spells]
[lands]
4 Steam Vents
4 Shivan Reef
4 Spirebluff Canal
4 Sulfur Falls
3 Mountain
1 Island
[/lands]
[/deck]

Then there’s the monoblack of the RTR-Theros era. Could that still work?

[deck]
[creatures]
4 Glint-Sleeve Siphoner
4 Pack Rat
4 Murderous Rider
4 Dread Presence
1 Gonti, Lord of Luxury
1 Kalitas, Traitor of Ghet
4 Gray Merchant of Asphodel
[/creatures]
[spells]
4 Fatal Push
4 Thoughtseize
2 Grasp of Darkness
2 Liliana, the Last Hope
[/spells]
[lands]
2 Castle Lochtwain
1 Cabal Stronghold
19 Swamp
4 Mutavault
[/lands]
[/deck]