Mirrodin Avenged

The condition is the whole design lever: destruction for a single black mana, but only against a creature that already took damage this turn. That gates it behind combat or a preceding burn spell, which is precisely the point. Black rarely gets to destroy any creature for one mana; the wounded-target clause covers the discount, turning what would be an overpowered removal spell into a follow-up. A blocker that traded down, an attacker your team chipped, a creature someone Shock'd earlier: the spell finishes what combat or another spell started, then replaces itself with a card. That trailing draw keeps the mode from being pure two-for-one setup, converting an already-favorable exchange into card advantage rather than just spending a card to close it out. It belongs to the finisher-removal line black keeps returning to: effects that clean up wounded creatures cheaply rather than answer fresh threats. The wrinkle worth noting is that "damage this turn" does not require the damage to have come from you, so an opponent's own combat math or a symmetrical damage source can set up the kill just as well. It rewards patience within a turn rather than raw tempo, sitting in hand until the damage is on the board and doing nothing at all until it is: without a legal wounded target, there is no spell to cast.