As people spent years talking more fluently about the game and the pool of cards became larger and less unique, regular, average bear eventually became shorthand for any regular, average creature, regardless of actual type, color, abilities, or eventually even the specific statline
The player who proliferates chooses which player that is
Anyway, thats pretty much it
These tokens are always white, always Zombies, and have no mana cost - which matters more than you might think
As with many myriad creatures, your opponents won't be happy getting hit even if you're not explicitly targeting them, so the entire table might band together to take this down.
This in the yard also threatens to flash in to kill an attacker if you have a mere eight mana lying around