This is a sponsored post
One of the reasons why Flesh and Blood continues to grow and be healthy is due to diversity. If there was only one viable deck of cards to play, tournaments would stagnate because players would have to play that specific deck, or one built to defeat it. This applies to both Skirmish and Blitz. More information can be found at: http://www.fab-deck.com/.
According to the FAB site, the developers goal is to “Our philosophy to card legality has been built into the DNA of our product design and organized play program, and aims to: Create dynamic meta-games for constructed tournament play and Support long term utility of card ownership”
To maintain the health and diversity of the tournament environment, there is a system of restricted and banned lists.
With Flesh and Blood being a new game there are still many cards trying to find their place. As a result, there are not too many banished cards. Moreover, certain cards are only banished for certain modes.
As a result, banishment has more to do with deck construction then with a particular card. For example, all decks may only use generic and cards that are of the same class as their hero choice. Therefore, your hero determines which cards are legal and which cards are not.
When it comes to classic, all decks have to be the official retail product if you are entering a tournament. Go Bananas is one of the few truly banned cards that cannot be used in a tournament for either blitz or standard.
This overview is to illustrate that the banishment of cards has more to do with the deck than cards. However, you need to understand two more important things. First, the restricted and banned lists are format-specific. This means that a card banned in Modern may still be legal in Standard. Second, the banished cards are always updated, so stay informed!