Scorched Rusalka

The cost is the whole governor here. Where a free outlet like Viscera Seer or Carrion Feeder lets a board empty itself at the speed of willingness, this one charges a red pip per sacrifice, and that single requirement is what separates a combo enabler from a closer. A no-cost outlet that pinged the opponent would loop without limit; pricing each activation at one red mana stops the engine from spinning into the infinite while staying cheap enough that any deck manufacturing endless bodies can keep firing. It sits in the aristocrats lineage as the finisher rather than the value piece: it generates nothing from creatures dying, it spends them, converting an army of persist loopers, undying recursion, token swarms, or sacrifice fodder into a steady stream of damage pointed at an opponent or a planeswalker. The 1/1 frame matters mainly as the last thing it eats. What it asks of a deckbuilder is an inexhaustible supply of fodder and a mana base that can keep tapping for red; once both are in place, it quietly turns a stalled or overflowing board into a clock. As a one-mana payoff that does no heavy lifting alone, it is the cash-out valve a fodder engine bolts on at the end: the piece that converts a board already flooding into lethal points.