https://magic.wizards.com/en/articles/archive/mtgo-standings/pioneer-challenge-2019-11-18

1. Mono-B Aggro: Diem4x
2. Mono-B Aggro: exoticherman
3. Mono-B Devotion: The_nayr
4. Mono-B Aggro: Ogre
5. UR Phoenix: pandachan12
6. Rb Devotion: GrilledCheese (splash black for sideboard stuff, mostly)
7. Mono-B Aggro: Gurmag_12
8. UR Ensoul: lazerblazn
9. Mono-G Devotion: poorkid676
10. Golgari Field: McWinSauce (I might buy this list)
11. Mono-G Devotion: h8cUn
12. Mono-B Aggro: LvdL
13. Mono-G Devotion: BigAnnie (The Great Henge)
14. GB Hardened Scales: kanister
15. 5c Niv: albertoSD
16. Bant Field: l4hlborg
17. UW Spirits: Rooney56
18. Mono-R Aggro: Jorge_Jung
19. Mono-G Devotion: Faellan
20. Bant Field: termidor
21. Golos Ramp: Lavfluris
22. Golos Ramp: pp8_
23. GR Stompy: TeamGreed
24. Golos Ramp: boromirofborg
25. Bant Field: d4ygum
26. Temur Midrange: Lein_
27. Mono-G Devotion: ProfessorFrench
28. Mono-G Devotion: grinderA
29. Br Aggro: Shorak123 (Glorybringer)
30. Possibility Storm Combo: tyobe0440
31. Gu Stompy: oosunq (Oko, Stubborn Denial)
32. Mono-G Devotion: willjetz1323

Direct link formatting thanks to my web scraper! If you encounter any dead or broken links, or have any questions/praise, please let me know in the comments

Behold, the five colors of Pioneer: blue, green, black, red, and Azorius!

At a glance, there are maybe 4 maindeck white cards in the entire top 32 (I saw a Fumigate and a few Hour of Revelation in the Bant Field lists)