OK, but why playing cards?
Playing cards are easy to transport, and often pass through the hands of many people. This frequent movement allows for more people to be exposed to the artwork on the cards.
The deck contains all sorts of herpetofauna (the collective term for reptiles and amphibians). Some of them are critically endangered, and some are invasive species. Each one was chosen for a reason. For example, the ace of hearts— the mourning gecko— was chosen because they can reproduce without a partner. As a result, the species is predominantly female.
Every time a game is played with these cards, your players will be exposed to a variety of reptiles and amphibians. Every card has a unique illustration that depicts the animals as they would be found in the wild. Maybe someone will discover their new favorite turtle, or decide to learn more about “that cool looking snake with horns”.