Underground Mortuary

A tapped dual is old, unglamorous fixing: it smooths your colors at the price of a turn's development. Bolting surveil 1 onto entry rewrites that trade. The land that would otherwise be pure setup now does a second job when it arrives, filtering a useless top card into the graveyard or clearing the way for a topdeck, and doing it for zero additional mana. That is the design move: the enters-tapped downside is being repaid not just in fixing but in card selection, which turns a category of land that graveyard-agnostic decks used to grudgingly accept into one that self-mill and reanimator strategies actively want. The surveil is deterministic and unconditional, firing every time the land enters the battlefield: on its natural drop, on a bounce-and-replay, or when a fetch finds it by its basic Swamp and Forest types. For the black-green pairing specifically, that graveyard-feeding matters more than the fixing: this is the color combination most likely to be counting cards in its yard, and the land quietly advances that plan while masquerading as inert mana. A small, repeated advantage that never reads as powerful on the type line but compounds across a game, a land earning back its tempo cost twice over.