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On the Mirror Image/Magic Missile thing, I think the way it works is like a light refraction; a copy made by Mirror Image is an exact real-time replica that mirrors whatever the caster is doing, so there's no reason why that wouldn't extend to looking like it got hit by a magic missile if the actual caster does. It just wouldn't have any effect on it other than visual. The Mirror copies aren't separate entities, they're reflections. So it looks like they're casting spells when the real caster does; it would also look like they get hit when the real caster does. (Also they all fit in the same 5 foot square, which means quite a bit of overlap between images, at least for medium-sized creatures) Try standing in a single 5-foot square in the real world with at least 3 other people, all face the same direction, and then start waving your arms around; it would be impossible to not be hitting each other, but with the illusory copies they would be passing through each other. The only way you could possibly be looking at individually discernable, separate images is if a low-level caster also rolled low on the d4 and only ended up with 1 or 2 images. And even then you're dealing with the light-retracting thing (the way sight and illusions work in the real world). It would be like trying to his something while wearing kaleidoscope goggles;even if you thought you saw which "copy" got hit (and was thus the real one), as soon as you focused on that it would still be kaleidoscoped.