Barleywine
The CMY theory has been around for awhile. (The theoretical basis for the GD's "flashing colors" are explained correctly by the concept of "visual complements" in CMY theory. The RYB "flashing colors" are based on so-called "mixing complements" and are a crude approximation.) Somewhat surprisingly, CMY theory is derived from the RGB (red/green/blue) additive color theory for light.
While magenta inks have been around for quite some time, only relatively recently have non-fading magenta pigments been developed for use in painting (the quinacridones). The Wendrichs used oil paints for the original GD Temple Tarot paintings. The colors in this deck are stunning!
My formal art education ended almost 50 years ago, so I'm well and truly out-of-date. The powerful colors of the deck (at least as well as can be seen from scans) are what make me want it. Any divergence in the symbolism I should be able to get my head around without much trouble (even if I wind up disagreeing with the reasoning).