Exodia has never been the best deck in the format, but ever since its release the deck has persevered as a rogue choice for duelists looking for the element of surprise against an unsuspecting opponent
This is a slam-dunk in any discard decks that can run it, notably Oskar, Rubbish Reclaimer, Sefris of the Hidden Ways, and any madness decks, which is an extremely fun and value-oriented mechanic that is underutilized in Commander
The deck is designed to fit perfectly thematically with Outlaws of Thunder Junction
It untaps your lands to let you have explosive turns, or to combo
Genome Hacking allows Mew ex to use any of the opponent's active Pokemon's moves, with a cost of just three energies
Giving help to the opponent doesn't seem like the greatest plan, but when the player can tribute the opponent's dark monsters as if they were their own, it seems worth it