Provided you have 10 or more cards in the Lost Zone, Fantina reduces the damage any of your Pokmon take from Pokmon V (including Pokmon VMAX, V-UNION, and VSTAR) by 120, potentially preventing your opponent from taking a critical knockout
All you have to do is jam in a bunch of counterspells, draw effects, and stall effects to keep your opponents on the backstep and focused on each other
Mirror Force X TRAP When an opponent's monster declares an attack: Destroy all your opponent's Attack Position monsters.
Accepting this reality can make the collecting process more enjoyable and less stressful
Dangerous Jungle Stadium During Pokmon Checkup, put 2 more damage counters on each Poisoned Pokmon (except any Dark-type Pokmon)
In short, the Reserved List is a comprehensive list of cards that Wizards of the Coast won't print again, and most of those cards are downright weird or at least are a product of their time