Mono-Black Vampire Lifedrain

A mono-black Vampire aggro-midrange deck that pressures with evasive creatures and can assemble an infinite life-drain combo with Bloodthirsty Conqueror and Enduring Tenacity.

Bloodthirsty Conqueror has flying and lifelink and gains you life whenever an opponent loses life, while Enduring Tenacity drains an opponent whenever you gain life. Once both are on the battlefield, attacking with Bloodthirsty Conqueror starts a loop: lifelink gains life, Enduring Tenacity drains the opponent, Bloodthirsty Conqueror regains that life, and the cycle repeats. Deep-Cavern Bat and Duress clear the way by stripping opposing answers before you commit to the combo.

Keep hands with two to four Swamps, at least one early creature or disruption spell, and a removal spell. Keep combo pieces only if you already have interaction and a realistic path to surviving until you can deploy them; otherwise mulligan toward a playable curve and disruption.

Early, deploy Deep-Cavern Bat or Forsaken Miner and use Duress to disrupt the opponent while attacking with evasive creatures. Midgame, use Bitter Triumph and Shoot the Sheriff to clear blockers and protect your threats, and use Diresight to dig toward the combo. Late, land Bloodthirsty Conqueror plus Enduring Tenacity and attack or otherwise trigger lifelink to win on the spot.

The deck is vulnerable to instant-speed removal on Bloodthirsty Conqueror and enchantment removal for Enduring Tenacity. Mono-black has limited answers to artifacts and enchantments, and the combo requires both pieces plus a life-gain trigger, so fast aggro and heavy disruption can race or break it.