Devout Lightcaster

The triple-white cost is the tell: this is a hate card built to be backbreaking in a strict mirror of color philosophy, not a flexible answer you splash. Protection from black handles the defensive half (it cannot be blocked, targeted, or damaged by black, walking past the entire suite of black removal and combat), while the enters-the-battlefield clause does the offensive work, exiling rather than destroying so the answer dodges regeneration, death triggers, and the recursion that black leans on so heavily. The exile target is broad on purpose: a creature, an enchantment, a planeswalker, any black permanent is fair game. The body is incidental; a 2/2 that shrugs off most of a color's removal is a clock that color genuinely struggles to interrupt. The cost is what makes the hate self-selecting: WWW asks for real commitment to white, so the card punishes mono-black hardest and demands nothing of decks that were never going to fight black to begin with. Among pointed hatebears that buy a narrow but devastating effect with an unforgiving mana requirement, few prosecute their prey this completely: it stonewalls the color on defense and strips a permanent on the way in, and the color it hates can do almost nothing about either half.