The One Piece Card Game relies on a colour system that determines which leader characters can be paired with which cards, and the general vibe of related card effects
[301] Diamond and Pearl were designed based on the DS's various features such as its Wi-Fi capabilities and slot for Game Boy Advance cartridge
A Rakdos creature for only two mana, upon entering the battlefield, Kroxa is immediately sacrificed if it wasn't put into play using the escape mechanic
The idea, at the time, was that we could create some extra layered complexity by having cards that could take advantage of the fact that most creatures have two creature types on them
It also works with planeswalkers activated abilities
Searching for a specific basic Pokemon, which in current card-playing parliance often means something as mighty as a Radiant Pokemon or Pokemon V, is handy enough