Blight Grenade

Two removal spells stapled together, and the design logic is in how they overlap rather than stack. The first line is unconditional single-target destruction: no toughness ceiling, no color restriction, whatever you point it at dies. The second line is a board sweep priced for a world where -3/-3 clears most early creatures and softens the survivors. The efficiency comes from redundancy of coverage: the mass shrink handles the wide board that a single kill spell cannot touch, while the destroy clause reaches for the one oversized threat that -3/-3 leaves standing, the fatty whose toughness outlasts a three-point shave. You aim the guaranteed kill at whatever the sweep will not finish, then let the sweep mop up the rest, all for the price of one card. It answers a problem black has long had at multiplayer tables: a spot-removal spell trades one-for-one against a whole board, and a modest sweeper gets walked over by a single resilient body. Fold both into one card and neither weakness bites as hard. The cost reflects the doubled effect rather than either half alone, and the sorcery-speed limit keeps it from being an end-of-turn blowout: you spend it on your own main phase, having already done the sweep's math and chosen where the destroy needs to point. The pairing is also more thorough than it looks against resilient threats: an indestructible creature shrugs off the destroy clause, but if the -3/-3 drops its toughness to zero, state-based actions send it to the graveyard anyway, sidestepping the very keyword that would blank a single kill spell.