Black has a very cynical worldview, and its core philosophy is that of self-determination and release from society's imposed limitations, so when things truly go awry, a Black hero capable of waking people up to reality is exactly what the world needs
And with the proliferation of Mana Vault, Grim Monolith and more, this is a great way to tell folks that you want to play that game too
Milling Yourself for Fun and Profit Innistrad Draft, it would (very reasonably) be assumed that they had drafted blue-black decks full of synergistic cards like Armored Skaab, Stitched Drake, Think Twice, and Silent Departure
Combos There are a lot of combos built into this deck the big ones are: Blasphemous Act into any combination of Spitemare, Stuffy Doll or Boros Reckoner
You might take away their fourth land or their preferred three drop but that won't actually do anything for two or three turns which greatly reduces the value of Blackmail being one mana