Shattered Crypt

Black's signature bargain (card advantage paid out in life) gets a scalable, two-sided knob here. The X meters both halves of the deal at once: you spend X generic mana on top of the double black to return X creatures, and then you pay X life on the back end. Returning five bodies means and five life, so the spell is doubly taxed: you need the mana to be sitting on a refill that big, and you need the life total to survive the cost of casting it. That self-correcting friction is the design at work; the deeper you reach into the graveyard, the closer you push toward the loss black's grindy decks are usually trying to dodge. It pulls back only creature cards, which fixes it as a board-rebuilding spell rather than a flexible reanimation outlet, and the sorcery speed denies you any end-of-turn or combat-window flexibility. The honest read is that the ceiling outruns the floor: by the time you have five creatures in the yard worth the X mana and the X life, you are often the player who has already lost the board this spell was meant to rebuild.