What is the potential outcome of failing to follow proper deck registration procedures?

When players fail to follow proper deck registration procedures, it can lead to penalties being issued. Such penalties are established to maintain the integrity of the tournament and ensure that all players adhere to the established rules. These can vary in severity based on the nature and impact of the infraction. In competitive settings, deck registration is crucial because it prevents issues such as swapping cards or manipulating a deck inappropriately, which could provide an unfair advantage.

The other choices relate to potential consequences that may occur depending on the circumstances. While a warning might be issued for minor infractions, or in some cases, disqualification might be a possibility for more severe violations, the direct consequence of failing to follow registration procedures typically leads primarily to penalties as a way to address the oversight. Allowing the deck to play as registered would undermine the purpose of deck registration and the structured environment of the tournament.