Polluted Mire

A land in your opening hand pays rent; the same land drawn off the top in the late game pays nothing. This black-mana tapland answers that imbalance by carrying its own exit. Early on, it taps for black like any other dual-purpose source. Once your manabase is full and you would rather not draw another land at all, you pay two and swap it for whatever comes next, turning a dead resource into a live card. That toggle reframes what the slot is worth: you are not gambling on lands versus spells at deckbuilding time, you are postponing the decision until the game tells you which it needs. The bill comes due in tempo, since the land arrives tapped, and that delay is what keeps a draw-replacement stapled to every copy from simply outclassing a basic Swamp. Cycling appeared across a one-per-color cycle of these lands, and the template proved sturdy: variants of the idea have resurfaced in nearly every era of design since, under new names and adjusted rates. The black member sits squarely in the middle of that lineage, neither the rarest nor the loudest of its siblings, but a tidy statement of the concept: a land built with the awareness that it might be surplus, and handed a way to cash itself out when it is.