I say we curse them to never find a matching pair of socks.
^This guy gets it. Curses are fun.
All magic can be used badly. Or not badly. A hammer can be a tool or a weapon.
How Blake uses her magic will be up to many future decisions. Right now I'm concerned about how difficult Black will make it to make allies. Having powers that look abhorrent, regardless of the purposes she puts them to, is a real problem. Using illusions and metamagic is a lot less instinctively frightening than most of Black's repertoire. That's highly significant.
Uh...first, metamagic isn't listed as one of the thing Blue does, and this is going by Alivaril rules, not MtG ones, so I wouldn't be so sure we can use it.
Second, while illusions and mind magic may be less
instinctively frightening to those who haven't experienced them first hand, they are likely viscerally terrifying for anyone who has, I've experienced one of the closest things IRL to total "you are no longer the driver of your body" level mind control (impulse control issues that left my conscious mind with only marginal control over my actions), and that shit was kinda traumatizing, even though about the worst thing I did was badly bully my little brother. Because I was left to the mercy of every passing impulse and thought in my mind, and even knowing something was a bad idea wasn't enough to stop me doing it. But at least those impulses came from my own mind, albeit the most juvenile and idiotic parts of it. Can't imagine how much worse an outside force causing that would be.
And illusions can be rather insanely powerful when used properly. Like, change-the-course-of-war, kind of insane. As Sun Tzu put it "Supreme excellence consists of breaking the enemy's resistance without fighting." Which, if you extend that to the individual in question not actively fighting, means getting people to shoot their own allies counts. Though I suppose a few days of being caught in a bad acid trip would also break just about any army or commander you can name. Hell, even just simple temporary short term memory loss, as I demonstrated in my most recent D&D campaign by covertly dosing two military commanders with water from a bootleg River Lethe, will really make it hard to run an army properly. Imagine what sort of havoc giving false orders through illusions could cause.
TL;DR, Mind Magic is scary shit, and anyone with experience with it will not be too happy to work with someone who uses it blatantly.
Excuse you. "Black cat Faunus bring bad luck" is a horrifying stereotype used before and during the Faunus Rights Revolution era to justify uprooting entire Faunus communities under the thinnest of justifications, and more recently to deny service to law-abiding Faunus under such weak excuses as "not taking the chance." In this essay I will
Hey, you're the one who offered us the chance to make it real. Personally, I'd find a deep sense of ironic satisfaction in making that stereotype a reality in the course of getting revenge on those who hold it.