Night of Souls' Betrayal

The legendary tag is the tell here: this is a permanent-anchor version of a sweep effect, a -1/-1 floor laid down once and left running rather than fired off and gone. That single subtraction reads almost trivial until you notice what it does to a board over time. It strips toughness from everything, so any creature already weakened to one toughness dies, every freshly cast 1/1 dies on arrival, and tokens that enter as 1/1s never resolve into a body at all. The static, board-wide nature is the point: it converts a token strategy or a go-wide aggressive plan into a non-functioning machine while your own deck, built around bigger bodies or noncreature win conditions, shrugs. The cost of the design is that it hits you too, and that symmetry is what kept this kind of anchor from being a runaway: you have to build a deck that wants every creature one smaller, or run no creatures worth dying. Compared to a one-shot wrath, it asks for patience rather than a single button-press; the value compounds turn over turn as opponents keep walking small creatures into a permanent meat grinder. The black-double-pip casting cost ties it firmly to the color of attrition and creature degradation, where slow grinding hatred is the whole strategy. It is less a sweeper than a tax on small creatures that never stops collecting.