Grim Harvest

Recursion that refuses to stay buried. The base spell is a plain creature-card retrieval, but Recover turns it into a recurring tax engine: every time a creature is put into your graveyard from the battlefield, you get the option to buy the card back for , and the only failure state is exiling it. The mechanic deliberately couples graveyard recursion to the act of trading creatures, so the spell that returns your dead also feeds on the next death to come home again. That makes it the natural backbone for a slow attrition build that wants to grind opponents out of removal: pair it with a creature you are happy to recur (a value body, a sacrifice payoff, anything with an enters trigger) and the Recover cost becomes a rent you pay over and over rather than a one-time investment. The tension the design resolves is how to give black a reusable recursion piece without giving it a free loop; the answer is a per-death window and a real mana cost attached to each return, so the engine only runs as fast as your board can afford to feed it. Left alone, it eventually exiles itself, which keeps the loop from being a passive inevitability and forces you to keep deciding whether this death is worth the mana.