# Decklists Some tournaments may require the submission of their decklists to the TO. If so the starting assortment of cards in the main, material, and sideboard decks may not be altered before the start of game 1 in a match. Deck checks can be performed by judges throughout a tournament or if reasonably requested by a player and ought to be performed before any cards are drawn from the deck for a game. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://trg.gatcg.com/tournament-mechanics/decklists.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.