Mono-Black Vampires
A Pioneer deck, by Phill_Hellmuth
3rd place at a tournament in Magic Online on 2020-06-24

Maindeck:

Creatures
4 Champion of Dusk
4 Dusk Legion Zealot
4 Gifted Aetherborn
4 Knight of the Ebon Legion
3 Murderous Rider

Instants
4 Fatal Push
2 Heartless Act

Legendary Creatures
2 Kalitas, Traitor of Ghet

Legendary Planeswalkers
4 Sorin, Imperious Bloodlord

Sorceries
4 Thoughtseize

Basic Lands
15 Swamp

Lands
4 Castle Locthwain
4 Mutavault

Legendary Lands
1 Nykthos, Shrine to Nyx
1 Urborg, Tomb of Yawgmoth

Sideboard:
2 Soul-Guide Lantern
1 Heartless Act
1 Kalitas, Traitor of Ghet
3 Rankle, Master of Pranks
2 Liliana, the Last Hope
3 Drill Bit
3 Lost Legacy