User blog comment:JBox2D/Miranda the Dark Emissary/@comment-24036535-20140515213118/@comment-24090662-20140516004029

Q ratio is because if her Q hits a target, it has a 1 second cd. It would actually have very high dps if you're landing it, but if they dodge it, it's down. I should probably cut the base cd, though.

Her w is supposed to be an escape or a way to get into position for an ult. It's not supposed to be part of her combo, it's mainly an escape. Similar to windrunner's E, now that I think about it.

E was supposed to have a long cooldown. Crap. That was a mistake, forgot to change it. Nice catch

It is a toggle, per se. Same way anivia and swain's ults have a short cooldown, so does this. Maokai's ult works the same way. It does high damage because it's single target and she can't do anything else while using it, so it sort of has to do more damage than anivia's.

For build, basically straight ap + mana, and her passive helps with the mana so that she can go straight ap if needed.