So you may have seen this recent announcement published by Wizards of the Coast admitting to the use of the incorrect cardstock on an undisclosed amount of dual faced cards (DFC for short) in Ixalan.
As a result of this announcement, the misprint community has seen the inevitable flood of people asking if their cards are misprints and flooding marketplaces like eBay with all these new "misprints" they've opened.
Even worse, there are people with significant youtube followings, who know little about misprints, spreading misinformation by directly comparing this mishap to Summer Magic!
I'm here to set the record straight:
IXALAN DFC's WILL NOT BE WORTH MORE THAN THE NORMAL VERSION OF THE CARD! NEVER.
If we look at eBay right now we can see that people are hoping that misprint collectors will buy these magical new misprints at exorbitant premiums. There's a small flood of flashlight photos and "Ixalan Misprint" listing titles all over eBay,
So are these cards even selling? Admittedly, a few of them are, but not for the insane prices that some people are putting them at. If you've read my article about how to figure out the value of your misprint, you'll recall that I brought up supply and demand. Any demand for these cards is going to dry up very quickly. The types of collectors who want to own a few or all of these most likely have already got them. The more experienced collectors won't be in a rush though and if they don't have them yet will wait for the over-hype to pass before picking them up. What I'm saying is that there's LITTLE TO NO DEMAND for these cards. A few have sold on eBay at slightly higher prices, but that ship has sailed.
So now that we've established a baseline for demand, let's talk about supply. For WotC to make a PA about the error means that they are expecting multiple people to run into these and they needed to acknowledge them to avoid any potential competitive REL issues. From that, we can infer that a significant portion of product has been affected. This is supported by the fact of how many people are finding these cards now. It's safe to say that this is a very common error.
If you wan't to figure out the price of a very common production error over the long term, you need to take a look at the other very common errors that have popped up throughout the history of magic. I'm talking about the hairy Runeswords, the shifted Gaea's Touch, Alpha Unsummon, and the myriad of other similar examples throughout magic's history.
Let's compare our Ixalan DFC to one of the more valuable recurring misprints.
Unlike the Lost Vale to its right and the other 3 aforementioned common misprints the Serra Angel/Time elemental is visually stunning. Anyone who knows either of the 2 cards or anything about magic can immediately tell that there's something wrong. To top it off Serra Angel is a very collectible card. There are reasons that this card commands a $75+ price-tag.
The Lost Vale on the other hand requires a flashlight to even verify that it is a misprint. Otherwise it doesn't stand out at all. It's arguably less noticeable than the hairy runesword. People are also unsure about if these cards will be considered marked due to the tangible difference from normal cards when shuffling. That's why it will never carry a significant premium.