I think the blink change might be too long; it makes blink the second longest build time in the game behind mothership (afaik).
The Caduceus reactor change is blizzard shooting itself in the foot I think. Why would you be making medivacs with access to battlecruisers? At that point you'd have transitioned from bio.
I fear they are going to end up with fungal like EMP. Sure its a missile but you can't actually dodge it. 15 Move speed is quite fast but we'll see.
Widow Mine change does nothing to address the ridiculous balance issues with complete harass defense. It still 1 shots mutalisks and 2 shots medivacs and warp prisms.
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