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.
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.
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.
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.