Elesh Norn, Mother of Machines
Two abilities pointed in opposite directions, and the second is the reason this card earned its reputation as a hatebear wearing a value engine's coat. Doubling your own enters-the-battlefield triggers is the flashy half: a second Blink payoff, a duplicate landfall bounce, another draw off a permanent that cares about arrivals. Note the boundary that keeps the doubling honest, though. It reads permanents entering, so it leaves death triggers and leaves-the-battlefield effects untouched; the reward is scoped to arrivals, nothing else. The clause that shuts opponents' permanents out of triggering anything is the scalpel. It does not stop them from activating abilities (a fetchland still cracks), but it silences the landfall trigger when that fetched land arrives, and it neuters any plan built on a permanent doing something the moment it enters: the incidental token generators, the blink shells, the enter-and-value midrange that keeps fair decks humming. A 4/7 with vigilance is not passive scaffolding either; the body holds the ground while attacking, so the disruption is not hiding behind a wall. This sits in a long white lineage of taxing legends that punish one specific kind of interaction rather than the whole board (Thalia, Guardian of Thraben and Hushbringer each pick a mechanic to deny). What separates this one is that it denies and rewards on the same axis, asymmetrically: the same clause that guts your opponent's engine supercharges yours. Legendary is the one real ceiling on a card that otherwise rewires every entering-permanent interaction at the table.
