Isolate

A surgical answer to a narrow problem: anything with mana value exactly one. The mana-value-1 restriction does all the load-bearing work here, and it cuts in two directions. It refuses to touch your opponent's bombs and midrange threats, which is why it never sees broad maindeck play; but it also refuses to overcommit, spending a single white mana to permanently exile whatever sits in that slot. The exile clause matters more than the rate. White's removal has always leaned on banishment over destruction precisely because it sidesteps recursion and death triggers, and this brings that finality to a class of permanent that outright destruction often handles clumsily: the mana dork, the one-drop hatebear, the cheap enchantment that quietly does the heavy lifting, the artifact rock that costs one. Because these are cheap, they are easy to undervalue and easy to leave standing until they matter. Doing the work at instant speed keeps the window open through your opponent's turn, so you can hold up an answer to a mana dork on turn one or wait for the threat that actually earns the card. The design is a study in tight targeting as a balancing lever rather than a downside bolted onto a strong effect: deliberately dead against most of the board, deliberately excellent against the sliver that shares its mana value. That makes it a hate card by construction, a tool you reach for when you already know what you are pointing it at.