A few thoughts on what this card might be (note, in all cases they don't help Fighters, Interceptors, Advanced, or Phantoms):
2-turns are white, title: This would be nice as it wouldn't be in competition for anything. Defenders and some Bombers might equip it for a point. I'd have trouble paying more than a point for it, because there's not that much a 2-turn can do that a 3-turn can't.
2-turns are white, mod: This would probably have to be free for me to use it on Defenders as that slot is pretty valuable on a Defender, on Bombers, it's basically the same as above.
All turns are white, title: This is nuts, and I'd probably pay real points to get a Defender with this. You could transition from Boom-and-Zoom to Knife-Fighter from turn to-to turn. Swinging that cannon around without really going anywhere would be awesome.
All turns are white, mod: This is good, and probably worth spending a mod slot on, but it's harder to justify than the Title, because that mod slot does real work with defensive upgrades. I could most easily see paying a couple points to put it on a cannon-less Defender that you plan to use as a knife-fighter.