Blightbeetle

Hate cards live or die by how precisely they name their target, and this one aims at a mechanic rather than a color or a card type: the second line shuts off +1/+1 counters on opposing creatures, and everything else is built to make that clause stick. The lock is total and prospective. Any means of placing a new counter is denied, whether it comes from a bolster trigger, an adapt cost, or proliferate reaching across the table; what it does not do is remove counters an opponent's creatures already carry. Protection from green is not incidental flavor here; it is armor for the job. The counter strategies this answers (hardened-scales piles, decks pumping a board with the green tools that historically own that mechanic) mostly wear green, so the protection lets the beetle plant its static ability and survive the fight-spells, combat, and Auras that would otherwise clear it. That produces a hoser with an unusual property: it disrupts a plan and defends itself against the very colors that run that plan, all on a body small enough to slip under most removal thresholds. The narrowness is the honest cost. It answers a specific engine cleanly and does close to nothing against an opponent who never reaches for a counter, which is the fundamental bargain of a pointed two-mana hoser like this: enormous leverage against the deck it was built for, dead weight against everyone else.