Most CCGs and similar games are centered around deck building. They appeal to the human use to create and have something to call your own. You can build an effective deck and say that is “your” deck. Most likely, nobody has created it before.
But most of these card games feature a counterintuitive system as well. Namely, deck restrictions. Often these come hidden in a mana system. Pokémon and Magic: the Gathering, as well as many others, include a system to power your cards with specific types of energy. These cards are different colors and types, but to what purpose? In games such as Netrunner, you can only have cards from one faction, or limited numbers of cards from other factions. But there seems no reason. These restrictions seem to hinder creative deck construction. Why do these games utilize deck restrictions?
TL;DR Why do CCGs have colored mana and faction-specific cards?
These are some really helpful insights. Thanks!