Cruel Celebrant

The line of drain-on-death effects starts with Blood Artist and runs through Zulaport Cutthroat: mostly mono-black or black-adjacent bodies that punish creatures dying by bleeding your opponents dry. What separates this one is the shape of the trigger. Where Blood Artist fires when any creature dies, this counts only creatures and planeswalkers you control, but it does count planeswalkers, which most of its predecessors do not. That distinction earns its keep in a color pair that runs planeswalkers heavily: every walker that burns out its loyalty, gets sacrificed to a converter effect, or dies to combat or removal is another point drained and another gained. The 1/2 body is deliberately unthreatening, because the card is not asking to attack; it is asking to sit back while a sacrifice loop or a token board turns each death into a two-point swing. The effect is strictly asymmetrical: opponents lose, you gain, and both happen on the same trigger, so what reads as incidental lifegain is really an engine for converting the natural attrition of a go-wide or sacrifice deck into inevitability, one creature at a time. It is the drain payoff white-black aristocrats had been circling for years, delivered at a cost that makes it an engine piece rather than a top-end finisher.