Nasty End

Instant-speed sacrifice draw is a design black has revisited for decades, and the tuning here is all in the legendary rider. Two cards for a creature you were happy to lose is the going rate: it turns a chump blocker, a spent token, or a body already marked for death into card advantage at the exact moment an opponent commits removal. The window is the whole point. Cast in response to a targeted kill spell, it converts a creature about to die anyway into two cards, and the removal fizzles for lack of a target. The third card for sacrificing a legend is the wrinkle that gives it a second gear: where legendary creatures fill the board, that escalation is nearly free, and it rewards a battlefield stocked with fodder disproportionately valuable to keep around but disproportionately good to trade away. The additional cost is the discipline: this draws nothing by itself, and the creature you feed it is a slot you already paid for elsewhere. That constraint is exactly why the rate can be so generous. Black's recursion and token engines have spent years making creatures cheap enough to throw away, and this is the payoff card that turns that surplus into a refill.