There are so many possibilities, especially when it comes to Pokemon cards
Abilities can either be active, which is used by tapping the Ability when checking out a card during your turn, or passive, where the effect will persist as long as the card is in play
The traditional vs simplified Chinese Pokmon cards split matters for collectors because they have different set codes and anti-counterfeiting features, along with their own release schedules
Even if you don't have one to hand your opponent has to respect that you might well have one and will likely draw one in enough time
Roserade GL's Poison Bind is also useful for turning off PokePowers while trapping a Pokmon Active
(2019-07-12) If Bag of Holding leaves the battlefield, the items it contained are exiled forever (and, perhaps, scattered throughout the Astral Plane)