Leyline of the Void deals with cards only
You can return one creature of each color from your graveyard, which makes it a flexible recursion spell
Thats not to say that you wont find powerful cards in a Set Booster indeed, each pack of 12 cards (plus two bonus, non-game cards such as art cards) contains 1-5 cards at the Rare or higher rarity level, making them a more appealing product in some ways than, say, Draft Boosters
For that $800, you get one thousand copies of each card you ordered for a total of about 54,000 cards
Ambusher lets you pass over your turn without giving up a meaningful play, rewards you for doing so on subsequent turns, and even pumps all your wolvid creatures!
GRANARY STUDIO The Granary is in the centre of Owslebury, opposite the church