Black Knight

The double-black cost is the whole pitch. This is not a creature you splash; it is a creature that asks you to commit to a mana base, and the reward for that commitment is a body that, against the right opponent, shrugs off most interaction through the red zone or the stack. First strike on a 2/2 turns combat math into a one-sided exchange against most early creatures; protection from white turns white blockers, white auras, and the bulk of targeted white removal into blanks. The pairing is the design lesson. Either ability alone is a role-player; together they make a two-drop that closes games against a specific archetype while remaining a competent beater against everything else. White Knight is the mirror, a companion piece that arrived alongside it, and the two cards together established the convention that Magic's color pie includes built-in asymmetric answers, not just asymmetric threats. Later designs (Silver Knight, the broader lineage of protection-from-a-color two-drops) inherited the shape but rarely the rate; double-pip costs at two mana have grown rarer as Wizards has moved toward more splashable threats. That shift is most of why the original still reads as the canonical version of the idea, and why the template later color-hoser two-drops keep echoing traces back here.