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)
JPN prices from SNKRDUNK/Mercari
A good way to check the prices people are selling Pokmon cards for is to check eBays sold items. The prices people are willing to pay for Pokmon cards are very high, but to be honest that is pretty normal collector stuff
A PSA 10 copy sold for $444,000 at Goldin Auctions in September 2023
Jumpstart (for beginners) The team behind the set opted to focus on a bigger-friendly product over precon decks, but some of these Jumpstart cards are mighty powerful and may ultimately show up in your Commander decks or even leading the charge
The cards also have historical importance, given that they commemorate the highest annual event within the Pokmon TCG