Each Collector Booster includes one rare or mythic with extended art, one foil mythic or rare, nine foil commons and uncommons, three special-frame cards (like showcase frames and Gilded foils), and one ancillary card (from a planeswalker deck or Commander deck, typically)
It doesn't matter whether or not the creature or creatures are still on the battlefield or whether the players or permanents they attacked are still in the game or on the battlefield
It shares the same moveset as its Special Illustration Rare counterpart
When it is attached to a Dark type Pokmon, they do 10 damage more
The thing just punches other stuff and turns it into itself
On the supply side, production cycles, reprints, and distribution all matter