toon 1

/castsequence Fire Elemental Totem,,,

toon2

/castsequence ,Fire Elemental Totem,,

toon3

/castsequence ,,Fire Elemental Totem,

toon 4

/castsequence ,,,Fire Elemental Totem

Basically the comma acts as a spacer, nothing is cast where there's a comma. Every time you push that button, the next shaman in line drops an elemental. You can also get creative, like putting a [reset=1200] right after castsequence. That means if you only use one or two elementals in 20 minutes, it resets after that time and your first shaman will be the one to drop it again.