Chaoslace

Color was something Alpha imagined you could attack directly, and the Lace cycle was the proof of concept. The premise: if Circle of Protection: Red shuts down a red source, then recoloring an incoming spell or attacker mid-combat is a real answer; if a red-hosing effect punishes red permanents, making a creature red exposes it. The whole cycle (Purelace, Deathlace, Thoughtlace, Lifelace, and this one) does one thing for a single mana at instant speed: it rewrites an object's color and nothing else, which presumes a metagame thick with color-hosers, color-matters triggers, and protection effects to exploit. That metagame existed, briefly, when the original sets shipped, and has not really existed since. The parenthetical clause about mana symbols remaining unchanged is the tell: the card changes color for the purposes of triggers, protection, and damage prevention, but not for casting cost or land-type interactions, which narrows the lever further (recoloring a Swamp does not stop it from being a Swamp). What survives is an artifact of a color philosophy Magic moved away from within a few years, preserved in amber as evidence of what Richard Garfield thought instants might be for before the format settled on tempo and card advantage as the dominant axes.