Senior game designer Daniel Holt explained that the decision to have each deck themed around one game allowed the team to "dive deep into the lore of each, capturing even more beloved moments from across the games storyline." When asked exactly how Wizards of the Coast came to choose the games that would be included in the crossover (I'm slightly disappointed Final Fantasy 9 didn't make the cut), Holt explained that Final Fantasy 7 and 14 were the clear picks due to their popularity, but that Final Fantasy 6 and 10 were chosen partially due to how many fans of those games were among the Wizards of the Coast team
Fountainport As a colorless utility land, you could do worse than Fountainport, which essentially turns all tokens into Clues
If you want to support a creature-based strategy while still casting your Opt and Preordain, put this Simic card in your command zone
Vivid Voltage (2020) was the Pikachu set of this generation, with Gigantamax Pikachu as its mascot
Admittedly, Fervor and Hammer of Purphoros already do this passively, but redundancy isn't something to be taken for granted in Commander