Havenwood Battleground

The whole design lives in the second activation: cash the land in and it produces two green at once, then leaves play forever. Tapped for one, it behaves like any green tapland; sacrificed, it pays out a burst of acceleration and takes the source with it. You never get both the ramp and the long-term mana, which is precisely the tradeoff that makes the rate work. The sacrifice is the cost of the spike, not a bonus on top of it. This belongs to a small monocolored cycle of sacrifice lands, one per color, each producing only its own color and sharing this exact shape, and the underlying idea (a land that spends its own future to buy present mana) has resurfaced across decades of design. The entering-tapped requirement does the real disciplining work: the burst always arrives a turn late, never a free turn-one explosion, so the only way to use it well is to plan the sacrifice a turn or two ahead. As an artifact of early land design, it shows Wizards treating lands as expendable resources rather than permanent fixtures, an idea that would take years to mature but starts, plainly, here.