Like most Pokmon cards, the value of Comfey 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 (Crown Zenith Galarian Gallery)
The potential is limitless, especially with the PC modding community, and it'll be exciting to see what creative fans will come up with
Squirtle is a little bit more relevant to the meta right now though with the Solid Shell Blastoise ex making rounds in some local tournaments recently
While the booster box sold by Heritage Auctions on July 24th had some visible damage to the box itself - the auction house rated the box as Very Good condition, despite some wrinkling and blunting - it estimated that all of the cards within the booster packs would have remained in Gem Mint condition, the highest possible rating for collectible trading cards
There are plenty of one-drop Goblins you might want to run
Older cards that used words like negate have received errata to refer to the correct type of counter