Sinkhole

Two black mana, one dead land, no questions asked. The rate is the entire story: land destruction priced at the same curve point as a hard counter, with no upkeep, no comes-into-play tax, no "unless" clause, no restriction on what kind of land you target. Every land-destruction spell that came after had to justify costing more than this. Stone Rain moved the price to three and shifted the color to red, where land destruction has lived ever since. Black's later attempts (Rain of Tears, Befoul, Contaminated Ground) all pay a mana more, accept a worse clause, or both. The card lays bare how early Magic priced disruption before the design team understood what permanent, repeatable resource denial does to a format: a two-mana spell that, cast on turn two against a one-land opener, can end the game before it starts. That recognition is why Sinkhole has never appeared in a Standard-legal set and why the design template (unconditional Stone Rain at BB) has effectively been retired. It survives from a moment when color assignments were loose and the cost of attacking lands had not yet been written down.