Sarevok, Deathbringer

The clock this Knight builds runs on inaction: symmetric life loss that fires at every end step, but only when no permanent has left the battlefield that turn. That "if no permanents left the battlefield this turn" clause turns the ordinary black midrange table on its head. Normally you want removal, sacrifice fodder, chump blocks, and token engines churning; here every one of those actions switches the payoff off for the turn, and switches it off for you as much as for your opponents. The result is a Stax-adjacent puzzle wearing a beater's face: to keep the trigger live, you have to assemble a board that does nothing while nobody is casting removal, blocking, or sacrificing, then punish the whole table for the stillness you engineered. The 3/4 body is also a dial, since X equals its power, so pumping it raises the life loss and pushes the shell toward voltron that happens to threaten a symmetric win. A second commander slot makes the deckbuilding literal, letting you graft an engine straight onto the payoff and tune toward either the pillow-fort lockdown that keeps permanents on the battlefield or the beefed-up power count that makes each frozen turn hurt more. Few designs express so cleanly the idea that the game state you want to enforce is itself the payoff: a commander whose real weapon is convincing everyone to stop trading.