The following event occurred at my store's 2HG FNM event:
Alpaca announces "
Master the Way“ and starts reading the card's text. He has neither tapped mana nor announced any targets. ”Draw a Card." He draws a card.
Nightingale (with lightning reflexes) snatches the drawn card out of Alpaca's hand before it touches the rest of the cards, and shuffles it back into Alpaca's deck. Nightingale then admonishes Alpaca about the need to finish casting his spells and waiting for any opponent responses before beginning to resolve them.
Alpaca is somewhat miffed that the card was shuffled back into his library instead of just being placed on top, and asks me whether his deck was really supposed to be shuffled.
Ultimately, Master the Way was countered by an unmorphed
Icefeather Aven bouncing the intended target. Alpaca once again draws a card for Master the Way, which Nightingale once again plucks from his grip and shuffles back into his library. This results in another judge call to confirm that the card draw of Master the Way is also countered.
In both cases, it is easy enough explain to Alpaca why his library had to be randomized. Alpaca's only lingering question is whether Nightingale should be making the fix herself before explaining why she was making it and confirming with Alpaca that the fix was correct.
I dodged getting involved in a discussion on that topic at that time. But for my two cents, I think that players self-judging at REL is a very convenient thing to have, so long as they're able to do so correctly. I didn't tell Nightingale to “keep doing what you're doing” but I had no inclination to tell her not to shuffle her opponents library until she's asked permission.
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As a side note: We run sealed 2HG at the first FNM after a release of a new set, and I would highly recommend this to other stores. Traditionally, the first FNM of a new set had super low attendance (about 8-10 people compared to our usual 23-26), presumably because most people hadn't built decks for the new standard in the ~18 hours that the set has been available for purchase. The 2HG events let a lot of people who usually just play prereleases the chance to play on Friday, which is a small step toward getting them involved in constructed Magic. Last Friday we had 54 players (27 teams) which I believe was a turnout record.