Presenting the wrong deck - Deck Problem & Forced Mulligan
At a recent event, a player had brought two different standard decks in similar boxes and sleeves. After having lunch and moving the boxes around, the player took out the wrong deck, shuffled without looking, and drew their starting hand. This was where I was called.
The Judges had some discussion during the event. From what I gather, this should “by the book” be a Deck Problem, discovered during opening hands, with a warning and letting the player swap decks. Then, we should instruct the player to mulligan.
I have heard opinions like“we need to do this to preserve integrity, policy serves its purpose”, “this is an unfortunate corner case and while we should follow policy, it doesn't really need to apply here” and “I'd be perfectly fine deviating from policy here.”
Had the player managed to present a Modern or Legacy deck instead of another legal deck for the format, I would want to deviate from policy. I have a hard time justifying any other ruling (though if you have an idea on how to do so, I'm all ears). Now, I'm less certain.
What's your take? Do you agree with policy? Is this simply significant and exceptional?