Book 1, Book 2, and Book 3 scene cards appear in non-foil and traditional foil in Play Boosters and Collector Boosters
Some high-ramp decks can get away with fewer, and slower control decks might use a few more
When Teval attacks, you mill three cards and return a land from your graveyard to the battlefield tapped
The set will be legal in Alchemy and Historic formats and receive the same support as a full release, including a preorder, Mastery Pass, and cosmetics.
You might want to read up on inventory management strategies in the Closo Seller Hub to keep your sales organized as you scale.
If Conspicuous Snoop gains a set of linked activated abilities (for example, one ability that exiles a card and another that refers to the card "exiled with" the object), that link only lasts as long as Conspicuous Snoop has those abilities