> For the complete documentation index, see [llms.txt](https://rules.gatcg.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://rules.gatcg.com/game-mechanics/game-mechanics-miscellaneous-topics/randomization.md).

# Randomization

Randomization in this game is used to determine outcomes of random events and the random ordering of decks after shuffling.

#### General Rules

1. For a method to determine outcomes to be random, an object used to generate a random result must be fair. 
   1. Objects considered fair for use in randomization include dice with two or more sides in which each side has an equal chance of resulting after tossing that object.
      1. A fair coin is acceptable as a two-sided die for this purpose.
2. When selecting random events, a die with more sides than results needed to be determined can be used if it is easily scalable or if there is a fair method agreed upon among players to determine results. 

{% hint style="info" %}
E.g., if a player must banish a card among five from memory, a D20 (20-sided die) may be used where values 1-4 are assigned to the card in the 1st position, 5-8 are assigned to the card in the 2nd position, 9-12 for the 3rd position, 13-16 for the 4th position, and 17-20 for the 5th position.
{% endhint %}

3. Sufficient shuffling and randomization of cards that are not uniquely identifiable, and having an opponent choose from among those cards, is considered a fair selection method.
4. For shuffling a deck, only methods that generate a sufficiently random state may be used.
   1. The deck shuffled must be in plain view of your opponent and/or event judge.
   2. After a player shuffles a deck, they present their deck to an opponent to cut or further shuffle the deck.