Fear

The original evasion aura, and the one that taught the game what "unblockable except by" was supposed to feel like. Fear is built on a now-foundational restriction: black's evasion is not raw bypass but a narrowing of who can stand in front, gated by the same color identity and the artifact catch-all that black struggles to interact with. The two-black cost is the discipline that holds the rate down. A one-mana version would have rewritten every black aggressive deck of the early game, and the printed cost still asks you to commit hard to a color that historically lacked ways to protect the enchanted creature from removal. The lineage is clean: intimidate generalized the template to any shared color, menace stripped it down to a numbers restriction the rules could enforce on any creature without an aura, and modern design has largely retired the keyword because the artifact-creature loophole became a genuine problem once artifact creatures stopped being a curiosity. What Fear represents, in retrospect, is the moment the game decided evasion would be a color-pie expression rather than a universal mechanic, and that decision shaped how every subsequent black creature with a baked-in unblockable clause got costed.