Usually, they are identical to a card in the box, only much larger
For instance, Pikachu exs attack adds "+30 damage for each of your Benched Lightning-Type Pokemon." If you copy this with Mew ex, it wont work unless you have Lightning-Type Pokemon on your Bench
I wanted a pairing that I could latch my lone wanderer and their pup fantasies onto, and dog commander Yoshimaru, Ever Faithful gives Reyhan, Last of the Abzan a canine partner to adventure with
While some stages are so simple you can brute-force them with anything that's "super effective," others are ridiculously hard and heavily RNG dependent, there are also others that are meant to be beaten by specific team compositions and abilities you might usually overlook or just be pure puzzle stages where you must follow a specific pattern to solve it
Grist, the Hunger Tide Grist is one of the coolest planeswalker cards to ever be made