Just in case the photos don't post.

I have the same issue in historic. Ive checked my historic deck as well and it says it contains errors when I go to save (it says it contains the following errors, and then nothing is listed. There's an error message on the deck but it says 0 cards are invalid. I've also manually scrolled through the deck and don't see any invalid cards. I actually played a match this morning no problem with that deck but then went to add a new card and now am experience this issue.

Here

I'm getting this as invalid deck, I tried every mode and none will let my try it

Hello Friends, I have a problem with Arena. It's happened several times, so i need to discover what's happening.

I was playing a tournament and I have to use the Direct Challenge. After choosing Pioneer (which is the tournament format) and picking my deck, the Arena show this: "Invalid deck. Deck validation failed." I'm attaching images. It's important to note that this is the same deck I use for ranking, and I have no problem there. I don't understand what's happening. Please help.

Thank you.