Each Jumpstart Booster from Foundations Jumpstart contains 20 cards, including at least one new-to- Magic card and all the lands you need for your Jumpstart deck
Magic: The Gathering is based on collecting cards, an aspect that has expanded well beyond the limits of the game itself
If an activated ability of a creature you control that doesn't have the same name as Marvin references the card it's printed on by name, treat Marvin's version of that ability as though it referenced Marvin instead
In theory, they could show up in other kinds of booster in the future, but its unlikely as Wizards will want to keep something special for the most expensive boosters
You see the Human Werewolf feature in Standard Gruul Werewolves and Mono-Green Aggro since its decently costed and gains all the benefits that other Werewolf cards may offer
In WotCs case, they made an official statement that there would be no reprints of the cards on the reserved list