On the minor arcana

[Plenum]

The thoth deck matches these concepts to astrology with Mercury in Sagittarius which I think reflects the same ideas.

what do you think about the rainbow in that card?

I guess it means that 'Swiftness' is able to encompass the whole spectrum (which is 7 colors of the rainbow - but the full set is an octave of '8').

I guess the main image also goes in 8 directions (of the compass).  

So this card/experience is not limited in it's range.

But the geometry is pointing towards an octohedron (a d8 from dungeons & dragons)

8 of wands is fire, the driving life force, passion, what-have-you, in the sephira of Hod, the sephira of logic and intellect. This energy enters into Hod energizing our mental functions and you get flashes of insight, your mind is moving at high speed coming up with ideas and solutions to problems etc and driving you to action. It's temporary though, not a sustainable level of mental excitation. On the positive side it represents a rush of mental energy which can be channeled into making positive changes, on the negative side that energy can be channeled recklessly or come up against barriers leading to frustration.

this is pretty frickin' awesome.

Approved

The swords always give me trouble I tend to draw the 9 when I'm suffering from stress-related insomnia. 4 and 6 of swords are alright though.

9 is lovely man.  Truly