Everglades

Part of the Visions tapland-bounce cycle, where each entry produces colorless plus one color and pays for its dual output by taxing your existing manabase. The friction here is steep and stacked: the land enters tapped, so it gives you nothing the turn it arrives, and to keep it at all you must return an untapped Swamp to hand. That second clause is the real cost. Bouncing an untapped basic surrenders the mana that Swamp could have made this turn, so on the turn Everglades lands you are down a mana, not even: you have spent a land drop to set yourself back. What you buy with that punishment is colorless-and-black fixing and a Swamp you can replay later, which is why the cycle saw most of its use as cheap bounce fodder rather than as honest dual-land fixing. The design lineage runs forward into the karoo bounce lands of Ravnica (Dimir Aqueduct and its cycle), which kept the return-a-land tax but dropped the sacrifice-or-die clause and widened the output to two colored mana. The Visions version is the harsher prototype: fail to control an untapped Swamp and the land simply destroys itself. The total bill (tapped, plus a bounce, plus the threat of self-destruction) registers as an overcorrection, a snapshot from before Wizards had settled how much tempo a nonbasic dual should reasonably cost.