They have their own set code: Through the Ages cards have the FCA set code, while main set Final Fantasy cards have the FIN set code
That high value might not stick around forever though - a copy can still be worth thousands of dollars, but other promos have overtaken the tailor over time
Was using the Warrior of Light as the lead ever on the table, perhaps with some sort of background/class system to let players customize their precon
I can provide some handy links to bookmark so you can check back in, but for now, your best chance of securing anything will be via the most trusted third-party resellers like TCGPlayer
While Torgal certainly has the potential to fetch a similar premium from a scarcity perspective, players seriously dislike the artwork
If you have another way to cause damage, perhaps with Tinkerbell - Giant Fairy, then you can quest again in the same turn