syzygymtg asked: Were the planeswalkers is WAR designed to be color balanced or were colors picked to best fit the individual cards?

A combination. The uncommon planeswalkers have three cycles - two five-card monocolor cycles and one ten-card hybrid cycle. The rares and mythic rares are not evenly color balanced although close. We chose our planeswalker line-up partly on story and party on color balance needs.