I hadnt seen them before I started creating the list, but a few others have tried something in the same direction in the past, with various flavors (Gamekeeper Games, Gamekeeper Rock)
Its also incredibly rare, appearing in less than 1% of English-language Collector Boosters according to the official collecting article for the set
According to the art, you're magically reaching into a game store and grabbing a booster
Imperial Bow is the best answer to Evasive characters and can help some of the smaller heroes like Aladdin and Anna trade up into bigger threats, while Thebes offers lore gain for challenging, allowing you to control the board without falling behind on points
I think Fantasy Flight Games should have stuck to their LCG model for this game because one of the things that really killed this game is the fact that you often needed 2-3 cards (with coinciding dice) in order to make a certain card playable, this was especially true about heroes so what you ended up with is a lot of cards and dice that you really couldnt put in a deck and remain reasonably balanced for the general power level of the game