Well i have seen this posted before but not in a shaman type editionso here it goes. in zangarmarsh you go to serpent lake and the mudfins frenzys are weak when you go to kill them oridginally i saw to use a aoe but heres for SHAMANS: Use stoneclaw totem to aggro them and once they have a good aggro magma or fire nova totem will pretty much wipe em out but before stone claw witch last for 15sec
times out use a chain lightning and if you aggro enough tons of greys make you a ton of money! i dont take very much credit since i have seen other posts like this but i thought a shaman edition was needed
EDIT: In 30min i also made 50 Unidentified plant parts and 120 grime covered scales and 20 riped fin scales