Radiant Essence

Color-keyed asymmetry was a Mirage-block signature, a design language built around the plane's factional conflict and the idea that creatures should care who they were fighting. Here that means a body that quietly grows across the table from a black deck and stays a vanilla green-white 2/3 against everything else. The trouble with the template is that it offloads the payoff onto your opponent's choices: there is no agency in it, no window for the controller to exploit, no decision that earns the buff. The bonus is also static rather than triggered, so it switches on and off as black permanents come and go; on paper that rewards attrition, but in practice the size just blinks in and out without anyone planning around it. The deeper problem is that the buff fights the curve. A creature whose value spikes only against one color is most relevant when you already know what you are facing, which makes it a reactive piece by construction: the card cannot generate its own advantage, only inherit one from across the table. That is a hard place to design a creature into, and it is why this strain of conditional asymmetry mostly stayed a Mirage-era experiment rather than a template later sets returned to.