No, planeswalkers do not count as creatures in Magic: The Gathering. They are a separate card type with unique abilities and characteristics.
Yes, planeswalkers are considered legendary in Magic: The Gathering.
No, planeswalkers are not considered players in the game of Magic: The Gathering. They are a type of card that represents powerful characters in the game, but they do not function as players themselves.
Yes, artifact creatures count as artifacts in Magic: The Gathering.
In Magic: The Gathering, tokens are considered creatures if they have creature characteristics, such as power and toughness, and are represented by a physical token card or object on the battlefield.
No, permanents are cards on the battlefield, ie Enchantments, Artifacts, Creatures and Planeswalkers that have resolved to the field, as well as Token creatures, and Lands.
Yes, creature tokens are considered creatures in Magic: The Gathering.
Yes, artifact creatures are considered both creatures and artifacts in the game of Magic: The Gathering.
Yes, lands count as permanents in Magic: The Gathering.
No, copying a spell in Magic: The Gathering does not count as casting it.
No, infect does not count as combat damage in Magic: The Gathering.
Yes, artifact lands count as artifacts in Magic: The Gathering.
Yes, artifacts count as colorless spells in Magic: The Gathering.