I close my eyes and swing wildly into the square.

[Satori]

So I'm fighting a pesky little multi-threat with what must be a half dozen miss chances layered on through illusion spells and amorphae, and whatnot.

So I close my eyes, effectively making me blind, and swing wildly into the square.  there.  Now I only face ONE miss chance, and with blindfight, I can re-roll it if i miss the first time.

Does this actually work the way I'm reading it?  Because that just seems kinda messed up...  Also, what about mirror image?  How does that interact with all this?

[Garryl]

Depends what the miss chances are from.

Concealment (including Blur, Displacement, Concealing Amorpha, and Greater Concealing Amorpha): Yes, because you're replacing whatever miss chance that granted with the 50% miss chance of total concealment. If it's some crazy kind of concealment that gives a greater than 50% miss chance, you might still have to contend with that (check the ability in question and what kind of concealment it gives or if it even is concealment instead of just acting like it).
   Note that the spells listed above do not actually grant a miss chance on attacks. They grant varying levels of concealment, so they don't stack with each other.

Blink: No. Your opponent still could be not there when you swing. Also, since if you can't see anything you obviously can't see invisible or ethereal creatures, you won't get that reduction in the miss chance (so 50%, or 20% if you can hit ethereal targets).

Mirror Image: Yes and no. If he has them all clustered in the same space, then you'll ignore them. If he has them split into different spaces, you'll still have to guess which one is your actual opponent to target that space.

Incorporeal: No. Whether or not you can see and incorporeal creature has no bearing on whether or not it will ignore the damage of a given attack. Ghost Touch weapons and Force effects are the only real counters to this.

[Maat Mons]

Ghost Touch weapons and Force effects are the only real counters to this.

A rapier of unerring direction (Magic Item Compendium) works too, but has some issues. 

[SneeR]

MIC's Blindfold of True Darkness has to be my favorite item for melee builds. Blindsight ignores visual illusions!

[Satori]

Depends what the miss chances are from.

Concealment (including Blur, Displacement, Concealing Amorpha, and Greater Concealing Amorpha): Yes, because you're replacing whatever miss chance that granted with the 50% miss chance of total concealment. If it's some crazy kind of concealment that gives a greater than 50% miss chance, you might still have to contend with that (check the ability in question and what kind of concealment it gives or if it even is concealment instead of just acting like it).
   Note that the spells listed above do not actually grant a miss chance on attacks. They grant varying levels of concealment, so they don't stack with each other.

Displacement:

The subject of this spell appears to be about 2 feet away from its true location. The creature benefits from a 50% miss chance as if it had total concealment. However, unlike actual total concealment, displacement does not prevent enemies from targeting the creature normally. True seeing reveals its true location.

Concealing Amorpha, Greater:

As concealing amorpha, except the quasi-real membrane so distorts your image and actual position that you gain total concealment (opponents have a 50% miss chance), but for a shorter period of time.

One could argue that they stack, as Dis doesn't *actually* give  TC.

Also, there are various class based abilities which are also visual...

It just seems unfair that X can have several effects active and have them largely negated by a guy with blind-fight swinging blindly.

[weenog]

Easy come, easy go.  As was already mentioned, there are several effects against which blindness won't reduce one's problems any.  If all you're going to do is pick up a couple of simple visual ruses and ignore your armor class, why should beating your defense take any more effort than you put into it?