I crafted Time Warp after seeing it used by an opponent during an Alchemy Ranked game; after crafting, the card appears in my collection, with a warning that the card is not legal in Historic or Traditional Historic. However, when attempting to add the card to my Alchemy deck, the card is absent. I used the search filters to isolate the card, but there were no results. If I do the same search while in "Collection" the card shows up.
While I am in my alchemy deck, it's just not there. If I change the deck type to Direct Match, the card suddenly appears. Because of this, I decided to change the deck type to Direct Match, add the card, and then change it back to Alchemy once the card was included. After doing this, the deck is moved to the bottom of my decklist and marked with the yellow triangle, as it says the deck has one non-format card. I submitted a support ticket for this issue and was given the type of answer one would expect to receive if they lacked a grasp on the mechanics of how card legality works. Granted, they checked my account and confirmed that the card was crafted. But I don't need confirmation of something I'm very much aware of, I just need to be able to put the card into my deck since I had to use a wildcard to craft it.

This is on the Windows client, but I also tried adding it on my phone which is an Android. Same problem. If I select the version of the deck which includes that card, the Play button is greyed out. Because it is my most recently used deck, I tried just hitting Play from the home page, and it popped up a "deck validation error"