Set boosters are the go-to for players who love to open boosters just for the fun of seeing what they'll get. Just like Collector Boosters are for collecting and Draft Boosters are for drafting, Set Boosters are for opening packs to see what's inside.
At least one foil in every pack.
These can be any rarity, so this is one of several places where players can get a rare or mythic rare in a single Set Booster.
Chance of multiple rares.
Between wildcard slots, the rare slot, and the foil slot, there a several ways to get more than one rare in a Set Booster.
Chance at The List.
25% of the time, instead of an ad or token card, Set Boosters contain a card from The List - interesting cards from anywhere in Magic's history, printed as they appeared (including art, frame, and expansion symbol) plus a small Planeswalker symbol in their lower-left corner.
Each Set Pack Contains:
 Adventures in the Forgotten Realms art card
 Adventures in the Forgotten Realms full-art basic land
 Adventures in the Forgotten Realms thematically connected commons and uncommons
 Adventures in the Forgotten Realms "head-turning" card
 Adventures in the Forgotten Realms wildcard rarity cards
 Adventures in the Forgotten Realms rare or mythic rare
 Adventures in the Forgotten Realms guaranteed foil card
 token, ad card, or card from "The List"
Look for these great cards:
Lolth, Spider Queen
Xanathar, Guild Kingpin
Set Name: Adventures in the Forgotten Realms
Number of Cards: 281
Configuration: 12 cards per pack