A group of playing cards is a deck of cards.
60, You can only have four cards with the same name in the deck.
The noun 'jack' is a common noun as a word for a device for lifting heavy things, and the face card in a deck of cards. The noun 'Jack' is a proper noun as the name of a person (place, or thing).
Rook
The Extra Deck is just the new name for the Fusion Deck. It contains all your Fusion and Synchro Monsters. A Side Deck is a group of 15 cards you can swap out in a Match Duel (a best two-out-of-three duel). How it works is after the first duel (or after the second duel if the score is tied), you can swap one or more cards out of your regular deck for the same number of cards from your Side Deck. This helps by adding cards on the spot to counter your opponent's deck.
magic trap and monster
You could say that the Jack stands for eleven in a pack of cards, since it comes right after the ten.
A knave is a dishonest man or a rouge or rascal. Its also the Jack in cards.
The version I found is The Deck of Cards Bible, by T. Texas Tyler.
Perhaps some kind of wordplay on the Jack in playing cards? Jack of Hearts, Jack of Diamonds?
deck of cards a gallon of milk elephant
You cannot activate a card that will 'do nothing', and you are also supposed to know the contents of your own deck. This goes for all search cards, if there is nothing left in deck for the card to add to your hand, then you can't activate the card.