Your decks
The decks you can read with. Choosing one changes the deck your next reading is made with — readings you have already kept keep the deck they were made with.
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Study follows the complete deck you are reading with when it can show all seventy-eight cards; otherwise it uses Arcanaform Core.
Some decks print their own card back. When you read with one of those, its back is used instead of the one chosen in your space preferences.