Here is a breakdown of rules for trading:

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Weekly Limit: There is a limit of 7 trades in 1 Gallery week. They can be used in a single day or spread out over the course of 7 days. Available trades reset with the refresh of the weekly Gallery progress. Unused trades are not carried over after the weekly reset takes place. You can check the number of available trades in the Trading section.
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Card Exchange: It’s always a 1-for-1 trading! You can exchange 1 duplicate Card for 1 missing Card.
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Cards Eligibility:
- Only duplicate Cards of rarity levels 1 through 5 can be offered for trading. Level 6 and 7 Cards are not eligible.
- You cannot offer multiple Cards in exchange for one Card or receive multiple Cards for one Card.
- You cannot receive Cards whose copies you already have from a trade, nor can you offer a Card to a Manager who already owns it.
Finalizing a Trade: A trade can only be finalized if both Managers agree to each of their offered Cards, respectively.