Morkrut Banshee

Morbid is a condition that asks you to do the killing first, and this Spirit is the cleanest demonstration of why that sequencing matters. A 4/4 body for five is a serviceable rate on its own, but the payoff (-4/-4 on a target) only fires if a creature has already hit the graveyard this turn, which turns the card into a two-part play: trade or sacrifice into the death trigger, then drop the Banshee and watch the enters-the-battlefield clause clean up a second threat. Without the morbid condition met, it is a vanilla beater that overpaid; with it, it is a body and a removal spell stapled together on a single line. The -4/-4 also rewards how you build around it: it sizes to kill most midrange creatures outright, ignores indestructible, and shrinks a blocker low enough to make an attack lethal even when it doesn't finish the job. The design lesson here is that conditional cards live or die by how easy the condition is to satisfy on your own turn rather than waiting on the opponent, and a deck stocked with cheap creatures to feed a sacrifice outlet on your own main phase makes the morbid trigger a formality. Treated as a value creature, it is unreliable; treated as the back half of a planned exchange, it is a tempo swing that arrives with its own card advantage attached.