He also helps fuel the deck with the +1 ability letting you discard a card to draw more cards, and mill a card getting you things in your graveyard and keeping cards flowing
That number includes all colored lands, utility lands, and multipurpose lands such as the MDFC Lands mentioned above
Yes, you can add a companion card to your partner with commanders as long as you meet the deck requirements for companion
These cards all have a similar format to the original Godzilla cards from Ikoria: Lair of Behemoths with the name of the original Magic: The Gathering card under the Universes Beyond name
Its a nod to the (in)famous Black Lotus, but in a more balanced and reusable form
You don't have to add four copies of each card to your deck though, and sometimes it's beneficial to have fewer copies and make room for other important cards