Valgavoth's Faithful (Mono Black)

An optimized mono-black midrange deck that disrupts with discard and pinpoint removal, grinds value through Overlord of the Balemurk and Unholy Annex // Ritual Chamber, and closes with Valgavoth, Terror Eater.

Valgavoth's Faithful is the deck's glue: a cheap mono-black body that attacks, blocks and trades, buying the turns you need to reach eight mana while providing sacrifice fodder and pressure. Unholy Annex // Ritual Chamber is the engine and the key Valgavoth enabler — Unholy Annex draws you a card plus drains for a little life every end step while you control a Demon, and Ritual Chamber makes a 2/2 flying Demon token every end step once unlocked. Because Valgavoth itself is a Demon, unlocking the Annex half first means the Ritual Chamber half immediately starts producing tokens, so your big flyer is never attacking alone. Overlord of the Balemurk works at both ends of the curve: cast with impending it is a cheap non-creature permanent that stalls the board, and cast normally it mills your library and rebuys creatures, smoothing your land drops and finding Valgavoth. Deep-Cavern Bat strips the opponent's best card on turn two, and that discarded card plus your own traded creatures feed Bitter Triumph's discard cost and Withering Torment's graveyard interactions almost for free. Preacher of the Schism is the extra body and deathtouch blocker that keeps the ground stable while the Annex grinds.

Keep hands with three or four Swamps plus at least one cheap play (Deep-Cavern Bat or Valgavoth's Faithful) and at least one piece of interaction (Bitter Triumph, Nowhere to Run, Withering Torment, Duress). Every card in the deck is castable off Swamps alone, so there is no fixing to hunt for — only land count and having something to do on turns two and three matter. Mulligan aggressively on zero/one-land hands, on hands with no two- or three-drop, and on hands that only function if you draw lands, because Valgavoth costs eight mana and you cannot keep a five-land prayer. Six-card hands containing a Swamp, a two-drop and a removal spell are perfectly fine to keep.

Early game (turns 1-3): make every land drop, deploy Deep-Cavern Bat and Valgavoth's Faithful, fire off Duress to strip the opponent's best interactive card or combo piece, and use Nowhere to Run, Bitter Triumph and Withering Torment to remove the opponent's fastest threats. Unstoppable Slasher comes down on turn three to start halving the opponent's life total and forcing blocks. Mid game (turns 4-6): land Overlord of the Balemurk (or drop it early with impending as a defensive enchantment), then resolve Unholy Annex // Ritual Chamber and start drawing extra cards every end step while trading creatures and keeping the board clear; Preacher of the Schism grinds the ground game. Late game (turn 7+): resolve Valgavoth, Terror Eater, let Unholy Annex // Ritual Chamber generate a Demon token every end step behind it, and attack in the air — Valgavoth converts the opponent's own graveyard into cards you can cast, so every trade makes your Demon hit harder and the game shorter.

This is a slow deck with an eight-mana finisher, so the fastest aggro and combo draws can kill you before Valgavoth ever resolves. Graveyard hate blanks Overlord of the Balemurk's rebuy value, and counterspells or instant-speed removal aimed at Valgavoth (after its ward cost is paid) can leave you with nothing. Unholy Annex // Ritual Chamber is fragile to enchantment removal, Duress is a poor topdeck against creature-heavy aggro, and flooding or screwing on 24 lands is punishing. Valgavoth is legendary, so drawing multiples clogs your hand, and mono-black has very few ways to protect it once it is on the battlefield.