Opening it will cause one of a number of random effects, some helpful (like "Reinforcements", which summons a group of heavily-armed dwarfs who will help defend your stockpile), and some harmful (like "Sclerosis", which causes a dwarf to lose all their skills)
Indistinguishable on the back [edit] The main issue to guarantee fair play in a card game is that all cards in the deck must be indistinguishable for any player who does not view the front side (if card sleeves are used, the term 'card' means the sleeve with the card inside)
Joke(?) aside, this could be part of a fragile combo-esque RG Prowess deck but is otherwise unexciting
But I like it best in assassin decks like Mari, the Killing Quill
Most importantly this is a very small sample size
First Edition Lorcana Cards One aspect of collecting TCG is obtaining First Edition Cards