In Commander, if your Commander is an MDFC, the tax is shared between both sides
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The six Spider-Man Magic cards revealed come from a product in the line called Spideys Spectacular Showdown Scene Box
But outside of Standard or Limited, the archetype starts losing speed
As you might expect, the Mewtwo pack in Genetic Apex is the first pack you should focus on to build a Mewtwo ex and Gardevoir deck in Pokemon Pocket
No matter what, the addition of a sixth color would be a huge shift in the multiverse of Magic, and would need some sort of wibbly-wobbly, timey-wimey explanation to explain where it came from