In the recent Magic: the Gathering Standard event tournament results, I have identified the deck build of Mono-Black archetypes is on Snow lands and creature sacrifice effects. The snow-covered lands mainly because of access to Faceless Haven, and the benefit from the Snow Sorcery Blood on the Snow. That sacrifice effects trigger the Learn ability, which can fetch late-game Lessons such as Mascot Exhibition.
I have found today’s decklist from the recent 2021 International Stop II (Eastern Time) @ Red Bull Untapped, which finished in the Top 8 out of the 1172 participants. Check out the full Mono-Black Control list below.
Maindeck
24 LANDS
4 Faceless Haven
2 Field of Ruin
3 Hive of the Eye Tyrant
15 Snow-Covered Swamp
20 CREATURES
4 Eyetwitch
2 Forsworn Paladin
2 Jadar, Ghoulcaller of Nephalia
4 Sedgemoor Witch
4 Shambling Ghast
4 Skyclave Shade
9 INSTANTS and SORC.
3 Deadly Dispute
4 Eaten Alive
2 Infernal Grasp
7 OTHER SPELLS
4 Lolth, Spider Queen
3 The Meathook Massacre
Sideboard
2 Blood on the Snow
1 Containment Breach
2 Duress
1 Environmental Sciences
2 Flunk
4 Go Blank
1 Mascot Exhibition
1 Pest Summoning
1 The Meathook Massacre
Reference: https://www.mtgtop8.com/event?e=32972&d=452375&f=ST