Common cards you can find include Jigglypuff, Magikarp, Charmander, Riolu, Alolan Vulpix, Alolan Diglett, Alolan Sandshrew, and Alolan Geodude
Gengar consistently ranks in the top 5 most-collected ghost-type Pokemon, and modern Sword & Shield Gengar prints with Trainer associations are rare
Sign overly dramatically, for example
If you've already got a lot of cards from The First Chapter, apart from the guaranteed foils in the 2 decks, it might be more cost-effective to put your money towards boosters, unless you're looking to pick up the cards from either of the starter sets quickly, then the fixed nature of the decks will get you those quicker than randomized boosters
Pool has a couple versions
(2021-07-23) The player venturing into the dungeon chooses which dungeon they will venture into