Hello, there already is Morph thread, but what I want to bring today is, problem during game.
When a player notice his own face-down card does not have Morph and call judge, what is the best fix?

We will have several options:
* Leaving as it is (face-down cards without Morph, so he cannot face it up).
* Ask player what he *was supposed" to play (he should misplay that card instead of another Morph in his hand), and exchange them (non-Morph to his hand, Morph to BF). non-Morph is revealed to his opponent.
* Remove non-Morph facedown card from game (to GY or exile).
* Return non-Morph to his hand. non-Morph is revealed to his opponent.

Of cource, interview and education should be done at any time.

In competitive, it is crystal clear GL, so no fix requied. In regular, what is your recommended fix?

This actually happened to me, as a player, at a PTQ at Competitive during Morph's first go round. I cast a Morph, passed the turn, picked up my hand, and saw the morph in my hand (it was the only one.) I called a judge immediately, while my opponent looked on puzzled. When the judge arrived, I explained to the judge what had happened, and even flipped up the “Morph” revealing that it was a Fever Charm. What happened next astonished me.

I got a warning, and was allowed to switch the two. I imagine this was because I called the judge myself, revealed the error (expecting a GL,) and could not benefit, and since there was only one card with Morph in hand, it was obvious what I was planning to do.

At FNM, I would probably do the same thing, only if there was only one card with morph in hand. Otherwise, I'm not certain how I'd handle it, but reveal/substitute seems most reasonable.

If he was supposed to play another card from his hand but confused the two, I think switching the card with the one that was supposed to be played is the most organic way to fix the game. All other solutions just replace a broken game state with another broken one.

If he wasn't supposed to play a different card, assumed that the card had morph, and any back-up is out of question, I'd be incline to just leave it as it, as the partial fixes are normally uses to restore the game state in a quick and easy way, not to try to bring justice by penalizing the offending player in a creative way.

Those solutions only apply to Regular REL, after an investigation for potential abuse made me feel nothing shady was going on.

The default solution is this:

Originally posted by Kenji Suzuki:

* Leaving as it is (face-down cards without Morph, so he cannot face it up).

Depending on a large number of subjective variables, there's probably a better fix, but leaving it as a 2/2 creature can never go wrong.

What I'm most worried about is a solution that feels unfair to the opponent, such as letting a player swap out their non-morph for a card from their hand mid-combat. We shouldn't be telling the opponent that there was only one morph in hand, so there will always be a little distrust if we allow a swap after the wrong card has been sitting out on the table for a length of time.

I didn't reply on this thread immediately as I mostly agree with Emilien, with a caveat noted by Glenn - I'd only let the player ‘swap out’ their morph if they caught the problem really quickly and if this is not in itself going to cause a lot of disruption.

And what if the error is noticed a few turns after and lets says that damage has been made? and the player has 2 cards with morph in hand?

Then I agree with Emilien, that your best bet is just to leave the game state as it is (as long as you suspect no cheating).