Llawan, Cephalid Empress

A hate piece aimed at exactly one color, and a deeply unusual one for its era. Where most prison effects from the early game taxed or punished a behavior broadly (a Sphere of Resistance slowing everything, a Chill that hit one color but only its spells' costs), this shuts blue creatures off twice over: the enters trigger bounces every blue creature an opponent already has, then the static clause locks the door so they cannot recast those threats or play new ones. The bounce-plus-lock structure is the clever part, because the static effect alone would leave existing threats on the board untouched; the entry sweep clears them first, so the two clauses cover the gap each would otherwise leave open. The mirror-match implications are pointed, since blue's signature creatures of the period were exactly the threats this answers cleanly. The cost of building this narrow is that against a non-blue board the bounce goes inert, leaving a four-mana 2/3 that blocks early and trades into nothing relevant. That all-or-nothing axis is the design tension: a card that either wins a matchup outright or sits in hand as a dead draw, with almost no middle ground. It belongs to the small family of legends whose text reads like a sideboard card stapled to a body, useful precisely because it is so specific about what it hates.