Blood Knight

The clean expression of an old design instinct: take a hatebear keyed against an entire color and put it on a body aggressive enough to want in the deck anyway. The protection from white does two distinct things, and both of them are offensive in nature. It walks past white's targeted removal suite (no targeted destruction, no targeted exile can name it), and it cannot be blocked by white creatures at all, because protection prevents that creature from being declared as a blocker in the first place. The 2/2 becomes a clock white simply cannot interact with on the ground: the attack resolves unblocked turn after turn, and the trades white most wants to make are illegal rather than merely unfavorable. First strike then makes it just as punishing against non-white blockers who might otherwise trade. The flavor logic (a red knight built specifically to humiliate white's chivalric order) lines up exactly with the mechanical logic, which is rarer than it sounds for color-hate creatures. The narrowness of the hate is what keeps it honest: against any non-white opponent it reverts to a plain 2/2 first striker, a fine-but-unremarkable two-drop with no upside to find. The card's whole value is conditional on white sitting across the table, which is precisely the bet a deck makes when it builds toward a known matchup rather than a generic field.