Sporemound

Landfall's most literal payoff: the trigger watches the lands you control, so every land you put onto the battlefield stamps out a body, no fetch clause, no restriction to basics or duals. The five-mana cost and the static 3/3 frame are the price of an army factory on autopilot, because once it resolves the engine runs itself. Each of your land drops makes a Saproling, and each extra land you can manufacture (a second drop from a ramp spell, a returned bounce-land, a fetch cracked for a basic) makes another, so the rate compounds in any shell built to flood the board with permanents. The design idea predates the keyword that names it: turning land development, the one resource every deck spends anyway, into a creature engine that scales with how greedy your manabase wants to be. What grounds it is the timing window. The trigger fires only when a land enters under your control, so a clean drop yields a single token and nothing more unless you have a way to put additional lands into play, and the 3/3 dies to whatever answers any midrange threat. The card inverts the usual build-around relationship: instead of a deck propping up a payoff, it asks you to assemble a stream of land drops, then rewards a board already grinding lands into play with a steadily widening line of fungus.