Mono-Black Vampires
A Pioneer deck, by Pokerswizard
1st place at a tournament on 2020-09-06

Maindeck:

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

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:
1 Grafdigger's Cage
2 Pithing Needle
1 Murderous Rider
1 Silversmote Ghoul
1 Noxious Grasp
1 Kalitas, Traitor of Ghet
2 Ashiok, Dream Render
2 Liliana, Waker of the Dead
3 Agonizing Remorse
1 Legion's End