What is the consequence of presenting a deck without sleeves?

Presenting a deck without sleeves can lead to a warning because sleeving a deck is a standard practice in Magic: The Gathering tournaments for various reasons, including ensuring card protection, maintaining a uniform appearance, and preventing marks that could indicate specific cards. When a player presents an unsleeved deck, it raises concerns about the integrity of the game and the potential for cheating through card marking or manipulation.

A warning is an appropriate consequence because it serves as a reminder to the player of the importance of deck presentation and the upcoming requirement for future games. The warning allows the player to correct the situation without facing more severe penalties, which reflects the goal of tournament rules to encourage compliance while also promoting fair play.

In contrast, being disqualified or not being allowed to participate is too severe for a first-time infraction like presenting an unsleeved deck. While there are stricter consequences for repeated infractions or more serious breaches of the rules, a warning is suitable for a less serious issue. Therefore, receiving a warning ensures that players are informed about the proper etiquette expected in tournament settings.