You get called over to a table at a Competitive REL event and both players agree that the player A had a face-down card which was taken out of the sleeve when it was cast. The player B played a spell to return the face-down card to the player A's hand. He did not reveal at the time and left the empty sleeve on the table. Player A passes the turn. After player B draws his card for the turn, he gets ready to attack and notices the de-sleeved card in his opponent's hand. Player B says, “you forgot to reveal,” and calls for a judge. What is the infraction/penalty that we should apply?

First - this is extremely unlikely, and therefore a corner-case scenario; after all, the entire purpose of de-sleeving your Morphs in that manner is so you can't accidentally fail to reveal it. How you can put an unsleeved card into your sleeved hand and not notice just boggles the mind…

Having said that? Yeah, you can just fix this (reveal the card, then have him put it back in his sleeve), downgrade (no GL), and encourage him to be more careful. (And then remember to walk at least 15-20 feet away before you burst out laughing… Heh!)

d:^D

I made an announcement in hopes that it would prevent game losses at the beginning of a sealed PTQ this past Sunday. The good news is we had no GLs due to failure to reveal morphs. A buddy of mine proposed the above scenario and I just chuckled and assumed we could downgrade. Thanks for the official answer Uncle Scott.