This block was made with cards from Ravnica block (RAV/GPT/DIS), Return to Ravnica block (RTR/GTC/DGM), and
Return-to-Return-to-Ravnica 'block' (GRN/RNA/WAR).
I chose to leave out the planeswalkers from RTR/GTC/DGM/GRN/RNA/WAR because of issues balancing either the guild-colored walkers
or the monocolored walkers well enough. Feel free to try that on your own, if you want.
Balancing out colors/pairs for final first attempt:
Monocolor target: 66 cards/color
W: +2
U: +2
B: No change
R: No change
G: -3
Multicolor target: 32 cards per pair, 1 card per wedge/shard
WU: -2
UB: -2
BR: -2
GR: +3
GW: -2
BW: -1
UR: +2
BG: +3
RW: +1
UG: -2
WUG: -1
UBR: -1
WBG: -1
Colorless/lands: Used to round out cube size to appropriate level (720 total)
C/L: +3