Gym Trainer #68 (Pokemon Shining Fates | Pokemon Cards) prices are based on the historic sales
However, the alternative rarities zig-zag this, as many are alternative arts or Shiny versions of less powerful common cards, and averted with Trainer cards, whose default prints are all rarity by default (except Fossils which are )
If you hover over 2nd packet at the top-right corner of a packet, the site will show you the packets that can be offered if the pack is selected first when playing Jump In
Burn mages run at least 4 Destructive Revelry style effects in their board, and the brunt of their damage will come from creatures anyway
The value depends on age, rarity, condition, demand, format legality, collectability, and reprint history