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You can produce a 4-color identity for your deck with pairings like these examples: Red, white, black, and green with Akiri, Line-Slinger + Reyhan, Last of the Abzan White, blue, black, and green + = Ishai, Ojutai Dragonspeaker + Ikra Shidiqi, the Usurper #16

Flexibility is good, and you also always get to surveil 1 on ETB, too

Each land enters the battlefield untapped and produces a primary color for the Esper shard

If Yarus, Roar of the Old Gods dies at the same time as one or more face-down creatures you control, its last ability triggers for each of those creatures

They probably wanted to show Nintendo that they have a strong plan AND some serious Pokmon TCG fans who can help provide artwork already lined up (on top of their usual art staff from Magic the Gathering)