Like most Magic: The Gathering cards, the value of Half-Kitten, Half- depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Unstable)
And I'm pretty sure Final Fantasy also sets several new records in the number of alternate-art versions: Cid is definitely the card with most variants in a single set, at quick glance the 163 extended-art legendary cards across FIN + FIC is another all-time high
The return of shrines came earlier than expected with their inclusion in M21
Even if it does go back up to full price, I'd still say this box set is good value on the whole
Using cards to buff it will buff every creature you cast while its on the field just as much, allowing you to go wide without sacrificing power
Though the hype for Charizard dates to way before it, the current surge in its value can mostly be attributed to the rapper Logic, who in October 2020 bought a copy for over $220,000