Higher-rarity cards tend to be splashier, more complex, or more powerful because Wizards uses rarity to help manage Limited formats and card complexity
It's interest comes from the fact that in addition to the look of the creature or spell they were asked to draw, the artists were also provided with a lot of background information
The logic of the scoring system is based on stuff like "real card prices", "prices in shandalar", "ai base value", "rarity" and other stuff
As much as Wizards seem to have concentrated on Black for cheap creature-based exile in cards like Epic Downfall, the need for White to have access to more absolute removal than effects like Oblivion Ring or Conclave Tribunal is crucial to the colors relevancy in Commander
Even Pikachu joins the Pokmon ex party in the Pokmon TCG: Scarlet & Violet Paldea Evolved expansion
The company published the interview on March 10