With them we can draw more cards per turn (by default, it is one at the beginning of each turn), switch between active and benched Pokemon, heal our creatures' HP, and so on
Making our opponent discard in the midgame could easily prove disastrous, putting two nasty threats in easy reach of reanimation spells, for example
However, the payoff is huge
The most dramatic crash this week is Greninja ex 214/167, crashing by nearly half when compared the the start of this year
After viewing the story, players can learn how to use the cards themselves in duels, and earn those very cards and sometimes even entire structure decks by completing the areas
Its good against the supporting decks in the meta, but bad against the big menace of the format