Horn of Greed

A symmetrical card-draw engine that costs nothing to feed because every player is already going to play lands. That is the design tension that has kept it interesting for two decades: it draws cards off the single most universal action in the game, and it gives those cards to everyone, including the opponents who can read the board as well as you can. But the trigger is narrower than the word "land" suggests. It keys off the special action of playing a land for the turn, not lands hitting the battlefield by other means; fetching a land into play with a ramp spell or a search effect produces nothing. The exploit lives entirely in the play-a-land step. Stack extra-land-drop effects so you can take that special action more than once per turn, lean on lands that return from the graveyard to be replayed, and the draw skews hard toward whoever built around it. The blunt version of the question is: how many lands can I play that my opponents cannot? The card predates the modern Group Hug shorthand, but it reads like a charter document for the idea: a politically loaded artifact that buys goodwill by handing cards around the table while quietly rewarding the one player set up to convert them fastest. It is also a clean reminder that a "symmetrical" effect is only symmetrical until someone builds the deck that makes it not.