Very short question on Communion Master and the slave matrix

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Hello,

wondering: does a Slave Matrix (forgable item with astral and earth) work on ALL persons who can hold it? I mean: will it also work with commanders who can cast no astral magic, or even no magic whatsoever?

(I am asking because I would like to try using a race such as Pangaia with no astral magic with my rainbow pretender, he forges some slave matrixes and gives them to cheap commanders (e.g. harpies), then my pretender need just cast communion master and his rainbow powers will be revealed?)

thank you for your info