Subtypes are ways for the game to make meaningful mechanical information on the type line of the card, and, if youre wondering, by volume, most of those subtypes are creature types
Any and all of them
Counterfeit Pokmon cards are a known issue, so always check seller ratings, reviews, and card images closely before purchasing
The Ultimate Former Yonko Set-Completion Hype Past Shanks Manga Rares, like the iconic OP-01 Super Parallel, consistently hold massive value, with PSA 10 copies trading over 200,000 today
These cards usually bear a stamp on the art to identify where they came from or have a special promo star in the bottom corner, so make sure to keep your eyes peeled for these sorts of markings on your cards
At the beginning of your combat, you toss a free +1/+1 counter on your stuff then one mana level two to give your any countered stuff (not just critters) ward to protect a bit