The Japanese side of the Pokemon TCG tends to lag slightly behind their English peers' prices, but they're certainly not cheap
This card fits so many different niches, and the activated ability sometimes ends games
Just like Black Lotus
Lets begin with three of those slots, and if you want Wizards breakdown, here is the link
Chandelure's first attack synergizes well with Ceruledge decks, as those strategies will always have several energy cards in the discard pile, so it will often deal 150 damage with very little resources required
I would expect that well get Shivan Dragon at rare, so perhaps this slot could go in a different direction, but if I had to pick a mythic dragon that hasnt been reprinted yet, Scourge of the Throne would be a solid candidate from Conspiracy