Am not sure if these are good or bad cards, but at least that's 80 additional CP into my collection.
Nowadays I would be happy for any reward card, but I very rarely receive them. I receive mostly alchemy and legendary potion charges. The Splinterlands rewards were much better in the previous years. I still remember receiving at least one card (sometimes even more cards) daily for completing the daily quests in 2019, and nowadays they are rare even in the season end rewards.
By the way, I have not seen these cards so far. Probably they are new cards. Enjoy playing with them.
Good luck and have fun.
These are Gladius cases (5 cards in the pack) and not the usual reward cards. So one only can get them from rewards via Guild Brawls and I think they can only be used in Guild Brawls and not in ranked battles. :)