Call to the Netherworld

Madness is the wrinkle that turns a modest recursion spell into a free one. Hardcast for its printed black mana, this is an unremarkable Raise Dead variant restricted to black creatures; discarded instead (to a looter, a rummager, an aristocrat engine, a hand-size requirement), it returns a black creature card from your graveyard for no mana at all. The card is built to be pitched rather than paid for, and that inversion is the whole design. It does not loop: this is a one-shot sorcery that resolves and goes to the graveyard, retrieving a single creature. What it removes is the friction on the recursion clock. Most graveyard recovery costs mana you would rather spend elsewhere; this one asks only that something discarded it, so the effect runs on the discard the deck was already generating anyway: the spare draw step, the looting trigger, the card you needed to ditch. The target restriction is what keeps it specialized rather than splashable: black creatures only, from your own graveyard, so it pays off a deck committed to one color and a graveyard plan, not a generic value tool. The black creatures it most wants back are the ones that want to die again (a sacrifice payoff, a graveyard-fueled threat, a value body that already entered once), which is precisely the kind of deck most likely to be discarding cards in the first place.