Korlash, Heir to Blackblade

Grandeur is the keyword that asks you to draw a copy of your legend and then throw it away, a self-canceling cost that fights against the singleton instinct and the legend rule both. The reward here is purpose-built around the body: pitching a second Korlash fetches two Swamps onto the battlefield, which means the discard does not merely tutor lands, it directly grows the creature it leaves on the table. That feedback loop is the whole design argument. A mono-black beater whose power and toughness scale with your Swamp count is already a payoff for going heavy on basics; the grandeur ability turns the spare copy from a dead draw into fuel for that same engine, ramping you toward a bigger Korlash on the next one. The regeneration cost keeps the thing alive through removal and combat, which matters when its size is tied to a resource opponents can attack indirectly by ignoring it and racing. As a piece of grandeur design it is the most coherent of the cycle: every other version reads as a build-around that wants two copies but rarely justifies them, while Korlash makes the second copy good even when you never trigger grandeur, because it is still a creature that scales with the deck you were always going to build.