I am very familiar with the game and it was one of my favorite games
As the Wonder Pick phenomenon suggested, this information showed that the cards that will be awarded are determined when the pack type is picked, not when a booster is chosen from the selection wheel
When you look past the viability, however, Crobat is extremely valuable
Gravekeeper's Descendant X DARK Level 4 [ Spellcaster / Effect ] ATK 1500 DEF 1200 You can Tribute 1 other face-up "Gravekeeper's" monster, then target 1 card your opponent controls
You can either force each opponent to pitch two cards and lose two life or put a non-dragon creature from any graveyard onto the battlefield at the cost of two life
Its basically the in-store equivalent to Heart of the Cards, where you get a fraction of the value of your card but its faster and easier than shipping them out