They line up with the two basic uses of discard: theme and utility
Extra Deck 2 Dinoster Power, the Mighty Dracoslayer X WATER Level 8 [ Dragon / FusionEffect ] ATK 2000 DEF 2950 1 "Dracoslayer" Pendulum Monster + 1 Pendulum Monster Must first be Special Summoned (from your Extra Deck) by Tributing the above cards you control
Lets take another example
two test prints for the 88x148 sleeved card trays in landscape and portrait orientation
Reward: Hourglasses x12, Wonder Hourglasses x36, Shop Tickets x10 Sobble and Rainy Scenery How to beat: Collect the Three-Star Immersive variant of Sobble, One-Star variant of Shroomish, and common variants of Surskit, Carnivine, Sewaddle, Applin, Numel, Poliwag, Politoed, Wooper, Castform Rainy Form, Toxel and any Vaporeon ex card