This prevents your opponent from activating any sort of battle traps that would mess with your attack, like monsters whose effects activate when theyre attacked
The Adventure Token series is based on classic fantasy RPGs, and has you create an 'Adventurer Token' (some cards also call them Brave Tokens, depending on where you look) before building your party around it
However, it can be argued that Pokemon Gold & Silver took what made Blue & Red entertaining and stepped it up to another level with new Pokemon, a new phone-like device, and the exciting Johto region.
What makes it stand out is the five display windows
There likely are plans for ranked Expanded eventually, but as it is, Expanded is restricted only to casual matches, and does not necessarily feature the format's entire card pool
You probably arent sitting on some of the rarest cards in existence, but that doesnt mean your collection isnt worth anything