A Game Rule Violation (GRV) in MTG tournaments is typically handled by issuing a Warning to the player who committed the error. The game state is left as it is, without any fixes, to avoid disrupting the strategies of both players. However, if the opponent had no chance to notice the error, the penalty may be upgraded to a Game Loss.
Bart Van Etten was disqualified at Pro Tour Modern Horizons 3 due to an intentional Game Rule Violation (GRV) during a match against Javier Dominguez. The incident involved a misplay with Nethergoyf and Not Dead After All, resulting in an unfair advantage for Bart. An investigation, including interviews with both players, led to the disqualification and reversal of the round 13 match result.
The judges played a crucial role in Bart Van Etten's disqualification decision. They launched an investigation after the issue was pointed out, likely asked both Bart and Javier for their sides of the story, and analyzed the footage of the match. The judges determined Bart's intent to commit a Game Rule Violation (GRV) and ultimately disqualified him.