[Saulot]

For those curious about the variables in the spell, without having to test it:

You get dust warriors and dust walkers. The warriors are better of the two. Here are some results with completely neutral scales:
Dust Warrior/Dust Walker/Total
11/31 42
12/13 25
16/16 32
14/36 50
9/27 36
9/18 27
16/32 48
9/25 34
16/34 50
11/39 50
11/19 30
15/33 48

As you can see, the max total of units tops out of 50. It should be noted that turmoil tends to be more random, but also have less warriors, averaging below 10. While Order tends to increase the number of warriors to around 15 on average and the total averages in the 40's.

It should be noted that luck and magic also factor in (I believe with the mages, and possibly with the units), though I haven't tested those because it starts to get complicated.

Also, never, ever, cast it outside a waste. The spell will work, but you'll only get one measely commander.