Mono-Black Vampires
A Pioneer deck, by Bloody
1st place at a tournament on 2020-03-21

Maindeck:

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

Instants
4 Fatal Push

Legendary Creatures
3 Kalitas, Traitor of Ghet

Legendary Planeswalkers
4 Sorin, Imperious Bloodlord

Sorceries
4 Thoughtseize

Basic Lands
14 Swamp

Lands
4 Castle Locthwain
4 Mutavault

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

Sideboard:
2 Damping Sphere
2 Leyline of the Void
1 Grasp of Darkness
2 Liliana's Triumph
1 Drana, Liberator of Malakir
1 Liliana, the Last Hope
2 Drill Bit
2 Infinite Obliteration
2 Legion's End