Hi, this is a low mana cost, high synergy mono black deck.
Viscera Seer + Fume Spitter + Mortician Beetle is a popular combination to start off with black sac deck.
Death Cultist and Bile Urchin were chosen to be included because they can sac themselves for free (which matters) and push these last bits of life from the opponent with or without Blood Artist on the table.
Demon of Death's Gate abuses the abundance of 1 drops for an explosive 9/9 flying trample on turn 2. Plus he is capable to sac three creatures at once, which makes him useful in the late game as well.
Same logic applies to Plunge into Darkness, which is essentially an instant speed "sac as many creatures as you like at once spell and find that immortal servitude along the way".
Grim Haruspex is just plainly awesome, especially since most of our creatures can sac themselves.
Finally Immortal Servitude is the main reason I chose to run 22 lands, together with beetles, haruspexes and blood artists it can make your turn very long and painful for the opponent.
Any suggestions are welcome, as while this deck seem to be working for me quite well it's nowhere near the state to be complete.
UPD: 1. Replaced Blood Artists with Zulaport Cutthroats. Blood artists drain better, but Cutthroats get around Leyline of Sanctity and similar effects. 2. added Tragic Slips to sideboard (don't think they are needed in main). Still not sure about pure card draw cards, so placed Sign in Blood to SB for now.
Consideration: a. Potentially it's worth splashing green (for a much more expensive manabase) to get to cards like Elvish Hexhunter and Elvish Scrapper which allow to deal with cards like Rest in Peace and similar graveyard hate.b. Dredge effects like Darkblast could be either added to the deck, or cards like Golgari Thug or Stinkweed Imp can outright replace Demons (maybe from SB).
