Last night I noticed that almost every champion/rare pack I came across had Mortar as one of their prefixes. I believe, out of the dozen or two I fought, only 3-4 packs did not have Mortar.
It seemed like more than half had Plagued.
Yet only two had illusionist. Only one had Horde. Only one had Invulnerable Minions (thank goodness!). Only two had Avenger.
In all the time I've spent playing (I'm up to Act II Inferno), I've only ever seen Missle Dampening once.
I know that some affixes only become available at higher difficulties (e.g. Invulnerable Minions only appears in Hell or Inferno), and some are only possible on rares or champion packs, but not both (e.g. Horde only appears on rares, and Health Link only appears on champion packs). But setting aside those restrictions, are some affixes "rare" on their own?
Is there any information about the relative frequency with which each affix appears? Is Missle Dampening really just uber-rare? Did I just get ridiculously unlucky with the RNG last night with all the Mortar Jailer Plagued X monsters I fought?