Mono Black Good Stuff

A mono-black midrange deck that uses discard and removal to control the board, then wins with the Bloodthirsty Conqueror + Enduring Tenacity loop or grinds out with value creatures.

Bloodthirsty Conqueror makes you gain life whenever an opponent loses life, and Enduring Tenacity makes each opponent lose life whenever you gain life. With both on the battlefield, any single trigger starts a loop that drains the opponent to zero. Duress and Deep-Cavern Bat remove answers, while Phyrexian Arena ensures you find the combo pieces.

Mulligan hands with no black source, one land, or no early interaction. Keep two-to-three land hands with a turn-two Deep-Cavern Bat or a removal spell, and be willing to keep land-heavy openers because of the high-cost payoff.

Early: use Duress and Cut Down to clear threats and strip answers. Mid: deploy Deep-Cavern Bat to protect the combo, use Bitter Triumph and Hero's Downfall to remove anything relevant, and land Phyrexian Arena for card advantage. Late: stick Enduring Tenacity and Bloodthirsty Conqueror together to win instantly, or beat down with Vein Ripper and sticky threats.

The combo is vulnerable to instant-speed removal and can be disrupted before both pieces stick. The deck is light on cheap creatures, so very fast aggro can outpace it. With mostly basic Swamps, missing a double-black four-drop can hurt.