Commander: Baral, Chief of Compliance
Speaking from the uninformed perspective of someone who's never opened an Unfinity pack, the set looks like it would be fun the first time you tried it, and then never again (outside of an Attraction Commander deck, which admittedly sounds like a laugh)
The way it works, is when Thassas Oracle enters the battlefield, you get to look at the top X cards of your library, where X is equal to your devotion to blue (how many blue mana symbols appear in the casting cost of all permanents you control)
Graveyard Trespasser's primary utility comes in the form of graveyard hate, exiling a card from an opponent's graveyard whenever it enters the battlefield or attacks, draining that card's owner for one life if it's a creature
Sephiroth and Aerith are both part of the main set for Magic: The Gathering Final Fantasy, rather than the Commander Precons, so they will show up in drafts and, possibly, Standard
Keen-eyed collectors will immediately recognize this as the expansion that introduced Shining Pokmon to the TCG