Ob Nixilis of the Black Oath

One of the earliest planeswalkers built expressly to sit in the command zone rather than support from inside a ninety-nine, and the design is honest about its math from the top. The +2 is a slow, symmetrical-looking drain that only touches your own life total upward: it keeps Ob Nixilis climbing out of burn range while chipping the table, the kind of attrition that wins long multiplayer games rather than races. The -2 buys immediate pressure, trading two of your own life for a 5/5 flier that both defends loyalty and threatens a clock; the self-damage is what stops the token-making from being pure value, forcing you to weigh board presence against your own survival. Everything points at the ultimate, an emblem that turns each creature into a repeatable sacrifice engine keyed to power, drawing and gaining in equal measure. That reward runs hottest with a greedy, high-power creature base and a stockpile of expendable bodies, which is exactly the tension the card wants: bleed the table with the +2, spend your own life on Demons, then convert the whole board into cards once the emblem lands. It is a synthesis of mono-black's two long-game instincts, life-drain and graveyard-adjacent card advantage, packaged into a commander that can close a game without ever pointing removal at a board.