One of my own numberless† cards, for those that have not seen such things before. Other companies that offer them include Chase (UK) and also the Apple card.
And yes this is a real, usable card and no I did not remove anything. This is how it is issued.
† It has a number obviously, just not printed on the card. I can access it though the app and website associated with my account and I also store it in my password manager for convenience.