comparing the matrix and potentiators in operation

[Plenum]

yes, I was thinking a lot today about the matrix and potentiator of the body ... and trying to explain them to myself ... they are 2 cards that I have worked with the least. That's what triggered this post; I thought I had a working hypothesis.

I guess I should have gone back and read a bit more of the source text

Ra explains things much more succinctly here:

78.11 Questioner: Could you elaborate please on the nature and quality of the matrix and the potentiator?

Ra: I am Ra. In the mind complex the matrix may be described as consciousness. It has been called the Magician. It is to be noted that of itself consciousness is unmoved. The potentiator of consciousness is the unconscious. This encompasses a vast realm of potential in the mind.

In the body the matrix may be seen as Balanced Working or Even Functioning. Note that here the matrix is always active with no means of being inactive. The potentiator of the body complex, then, may be called Wisdom for it is only through judgment that the unceasing activities and proclivities of the body complex may be experienced in useful modes.

The Matrix of the Spirit is what you may call the Night of the Soul or Primeval Darkness. Again we have that which is not capable of movement or work. The potential power of this extremely receptive matrix is such that the potentiator may be seen as Lightning. In your archetypical system called the tarot this has been refined into the concept complex of the Lightning Struck Tower. However, the original potentiator was light in its sudden and fiery form; that is, the lightning itself.

as to your question, I think the Significator comes into play here, as that is the actor (and the one acted upon).