A very low mana cost mono-black deck. The demons will most definitely be cost for less than what their CMC is

Play Lands (obviously) until you get enough for immortal servitude (4 in this instance) or secret salvage (5)

Shadowborns are useful to summon demons

Lose Hope and Temple of Silence scry to help with win con

Secret Salvage can bring all shadowborns to your hand. When the turn end, discard excess shadowborns due to maximum hand limit

Immortal Servitude , when cast for 4 mana, brings all one costs from the graveyard to the battlefield, mostly the shadowborns so that demons can be cast

Put some early pressure on by summoning a Demon of Death's Gate using 3 shadowborns. Don't worry, You'll probably get them back later.

Griselbrand , Apocalypse Demon , and Extractor Demon all do lots of damage, being the win conditions

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95% Casual

Competitive