Im going to highlight the cards that I think work the best with Tidus, and/or the cards that I think are the most likely to impact the Commander format more broadly
(Choose up to three creatures you control to be in your group until you form a new one.) Whenever you attack or block, if CARDNAME is in your group, creatures in your group get +1/+0 until end of turn
If lore counters are removed from a Saga, the appropriate chapter abilities will trigger again when the Saga receives more lore counters
Starter Kit The Starter Kit comes with two Standard-legal 60-card decks, designed to create an interactive learning experience for two
Here's Your First Look at Over a Dozen New Cards From Magic: The Gathering's Upcoming Final Fantasy Set Sephiroth, Cecil, Yuffie, Garland, and more make their appearance
Since "any number" includes zero, you don't have to choose any permanents at all, and you don't have to choose any players at all