You can find a complete list of formats and their unique rules in the link below:
http://www.wizards.com/Magic/Magazine/Article.aspx?x=judge/resources/banned
You can find a Magic: The Gathering tournament locator on the official Wizards of the Coast website or by using the Wizards Event Locator tool.
The pace of play in Magic: The Gathering is sometimes considered too slow for tournament standards, as players have a limited amount of time to make their moves.
The legal Magic: The Gathering sets for tournament play are determined by the format of the tournament. The most commonly played formats are Standard, Modern, Legacy, and Vintage. Each format has a specific list of sets that are legal for use in deck construction. It is important to check the official Magic: The Gathering website or tournament guidelines for the most up-to-date information on legal sets for each format.
There are over 20,000 different cards in Magic: The Gathering.
I presume that you mean tournament packs. If so they are random.
The standard deck size for tournament play in Magic: The Gathering (MTG) is 60 cards.
The official ruling on the Nexus of Fate card in the current Magic: The Gathering tournament format is that it is banned in Standard and Historic formats, but legal in other formats like Commander.
No, lands in Magic: The Gathering are not colorless. They can produce mana of different colors to cast spells.
In a Magic: The Gathering tournament, 2HG Sealed rules require each team to build two decks using six booster packs. Each team shares a life total of 30 and takes turns playing together against another team.
The official ruling on the use of "Wish" cards in Magic: The Gathering tournaments is that players are allowed to use them, but they must adhere to the tournament rules and guidelines set by the event organizers.
Enchantments in Magic: The Gathering can stack if they have different names and do not have conflicting effects. Multiple enchantments with different abilities can be on the same creature or player at the same time.
When playing with Luxior in Magic: The Gathering, follow the specific rules and guidelines outlined on the card itself. Pay attention to any abilities, restrictions, or interactions with other cards that Luxior may have. Be sure to consult the official Magic: The Gathering rules for any additional clarifications or rulings.