W♄ite Magic (Solution)

by Derek Kisman, based on an idea by David Roe

Here is an unordered list of answers to the twenty round puzzles, for reference. The colors identify which puzzle answer this is (e.g. DAMP is the answer to the red/green edge cubelet). 
        RYB   SHLEP
        RY    EXTANT
        RYG   DEDITION
        RG    DAMP
        RWG   BOIL
        RW    UNARY
        RWB   CONTIGUOUS
        RB    BASSIST
        YB    SLAUGHTER
        YG    BEER CHUGGING
        WG    EDITH PIAF
        WB    CREAM OF TARTAR
        OYB   ARMORED RECON
        OY    HYPAPANTE
        OYG   COMMEMORATIVE BATS
        OG    DERRICK TRUCK
        OWG   BROWN ROT
        OW    ATTORNEYS GENERAL
        OWB   SACROSANCT
        OB    IMPROMPTU

Using the ‘Magic Square of Saturn’, clued by the title’s use of the word magic and the symbol for Saturn instead of the h in white, we can assign a number to each cubelet which has a white face. Use this number as an index into the answer and read in a circle (ignoring the center face’s 5) for the answer ALFRESCO.

   A- 3 UNARY
   L- 4 BOIL
   F- 9 EDITH PIAF
   R- 2 BROWN ROT
   E- 7 ATTORNEYS GENERAL
   S- 6 SACROSANCT
   C- 1 CREAM OF TARTAR
   O- 8 CONTIGUOUS