Yes, any cards in a library are part of the game. Note that 'library' refers to the stack of cards that you draw from. A more standard analog may be 'deck' but in the context of magic that refers to all cards you own in all zones and your sideboard.
You can not. They are not part of Magic the Gathering.
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It would be almost impossible to "guess" which card from the test Set was created first. I do remember reading somewhere that the original art for the card Heal was Spock and the Dwarven warriors card were the Dwarves from Snow White. Alpha was the first official printed set and as Air Elemental was the first card of that set technically that would be the first card.
It is part of the gaming series, to an extent. It's more part of the game's universe rather than a title in the series proper.
Game Grumps - 2012 Adventures in the Magic Kingdom Thrill and Thrall - Part 3 was released on: USA: 17 October 2012
Game Grumps - 2012 Adventures in the Magic Kingdom Wild Goof Chase - Part 2 was released on: USA: 14 October 2012
No part of Gathering Blue is really fantasy. It all could happen.
Hint: six is 3 three is 5 five is 4 4 is the magic number. look at the word. ignore the number part.
Game Grumps - 2012 Super Mario Bros- 2 Magic Potions - Part 1 2-1 was released on: USA: 26 June 2013
Its legs for the gathering of pollen, it mouth for the gathering of nectar.
Verb.
Yes, The Gathering is the first part of a trilogy, and it is followed by The Calling and The Rising.