A tournament consists of best of three games in a set umber of rounds. The standard is 6 rounds, with the Top 8 players competing at the end of the tournament.
As found on the Wizards website:
Constructed Tournament
Tournament Length
Number of Swiss rounds based on attendance according to the following chart:
Swiss Rounds9 - 16417 - 32533 - 64665 - 1287129 - 2268227 - 4099410 or higher10
Advancement
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.
Altered art cards are allowed in Magic: The Gathering tournaments as long as they meet certain criteria set by the tournament organizer, such as being recognizable as the original card and not providing any strategic advantage.
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.
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.
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.
Yes, you can sacrifice a creature at any time in Magic: The Gathering as long as you have a card or ability that allows you to do so.
Till someone destroys them
In a game of Magic: The Gathering, you can play as many planeswalker cards as you want, as long as you can afford to cast them and they don't have the same subtype.