Eradicate

The exile clause is doing more work here than the removal itself. Killing one creature is routine; what this offers is the deck-search-and-burn that turns a single point of interaction into permanent attrition. Find a player's threat, exile it, then go digging through graveyard, hand, and library to exile every other copy by name and shuffle them out. Against a four-of, that is one card answering four, and the targeted threat never comes back from any zone. The design lives in the gap between the surgical effect and its cost: four mana at sorcery speed, demanding you wait until a creature is actually on the battlefield before you can name it, which keeps the card from preempting threats it has not yet seen. The nonblack restriction is the other lever, a quiet rule that the era leaned on to keep black's removal from cleanly answering its own mirror. What it represents is the philosophy that black's removal should be unconditional but expensive and conditional in its targeting, paying in tempo and timing for an effect that strips a card not just from play but from existence. The naming clause makes it a metagame answer rather than a spot-removal spell: its value scales with how many copies the opponent committed to a single threat, which means it punishes redundancy more than singletons.