Drop rates
Having more achievement points gives you a little more magic find, like 1% every 2k or something. There’s also food, banners, and guild improvements which give more magic find, but that wouldn’t be more than 10% for the latter two. Commander tags don’t influence mf as far as I’m aware.
http://wiki.guildwars2.com/wiki/Magic_find
MF is the only loot-affecting stat. There are plenty of consumables you can use to temporarily boost your MF, among other things. Commander tags have zero effect. See the wiki page for ways to boost your MF.
Also note that due to RNG and peoples’ egos, the numbers you see people throw around as to how many rares they get per run, per day, or whatnot are usually atypical or exaggerated. Remember to take hearsay with a grain of salt
and style to turn them into craters and dust.” -Tonn
Number-crunching for ecto salvages – periodically updated