Crippling Fear

The trick of this design is that the sweeper points inward as easily as outward. Most asymmetric board wipes in black lean on a fixed axis (nonblack creatures, or nontoken creatures, or some quality the caster's own deck happens to dodge); this one hands the exception clause to the player at cast. You name the type your board is built around, and everything else shrinks by three in both directions. That fuses a tribal payoff and a removal spell into one slot, and the two roles pull opposite ways: a mono-tribe board turns this into a one-sided wrath that spares your side entirely, while a scattered pile of one-ofs gets no protection at all. The -3/-3 sizing is doing careful work too. It clears most of what a curve-out puts down but leaves anything with four or more toughness alive, so a deck leaning on a single large threat can shrug the whole thing off. Noncreature permanents (planeswalkers, enchantments, the artifacts a control shell relies on) never enter the equation, since the spell only touches creatures; the answer to those has to come from elsewhere. The result is a wrath that rewards committing to a single type rather than punishing it, a narrower and more pointed brief than black's usual "everything dies" sorceries. It clears the board for anyone who has already picked a lane, and does nothing for anyone still hedging.