Black Sun's Zenith

The scaling sweeper that does its work through subtraction rather than destruction. Where most board wipes pile dead creatures into graveyards, this one shrinks: X minus-one counters land on everything, killing the small outright and crippling the rest while leaving survivors permanently diminished. That counter mechanic is the whole strategic difference. Indestructibility does not save a creature whose toughness hits zero, regeneration cannot answer a stat reduction the way it shrugs off lethal damage, and a token army evaporates at a far smaller X than the fatties beside it. The counters also short-circuit the recursion mechanics that punish damage-based wipes: a persist creature dies with these minus-one counters already on it, so the "if it had no -1/-1 counters on it" clause fails and persist never triggers at all. The other half of the design is the shuffle clause. Rather than vanishing to the graveyard or exile, it tucks itself back into the library, which makes it a recurring answer for any deck patient enough to draw it again and a natural target for tutors that can fetch it back on demand. The cost geometry rewards a mana surplus: at low X it is cheap precision against weenies and mana dorks, while a late flood of mana turns it into a one-sided reset that clears whatever you have built to outsize. It asks you to read the table's toughness curve and buy exactly the X that clears it, no more.