Flagstones of Trokair

Most lands give you mana and then sit there; this one fights when it dies. The death trigger is built to punish exactly the effects that prey on lands: a Wasteland or Strip Mine that blows it up just hands you a Plains in its place, so the trade nets your opponent nothing and costs them a card. That makes it the rare land that wants to be killed, which is also why it became a quiet enabler of land-recursion engines that turn destruction into card advantage. Pair it with a sacrifice outlet that targets lands, or any effect that puts it into the graveyard on your terms, and the trigger becomes a repeatable Plains-tutor: thin the deck, trigger landfall, feed a loop. The wording is precise about the window: the ability fires when the land is put into the graveyard from the battlefield, not when it is milled straight out of the library or otherwise reaches the graveyard from somewhere other than play. The engine therefore asks you to control the moment of death rather than hope for it. The fetched Plains enters tapped, a small tax that stops the loop from being free tempo, but in a build sacrificing lands for value the tempo was never the point. It reads like a clean mono-white utility land and plays like a combo piece waiting for the right outlet.