To transfer a card in your Pack to the Vault, you need to have either 5 (or more) identical cards, or 5 (or more) cards of the same color (but not necessarily the same collection).
From your Pack, click the vault icon, then select at least 5 cards. You will only be allowed to select the cards that meet the criteria for being Vaulted.
For more information, please read this article on Vaulting cards.
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