Vault

The Vault is part of the economy in Magic: The Gathering Arena.

Each time a player recieves a fifth copy of a card as a reward from quests, events or opening a pack, a certain amount of Vault Progress Points are added to the Vault — instead of adding the fifth copy to the collection. The amount of Vault Progress Points depends on the rarity of the recieved card.

Rewards
Once a player reaches 900 Progress Points the Vault can be opened and rewards
 * 3 Uncommon wildcards
 * 2 Rare wildcards and
 * 1 Mythic Rare wildcard.

Vault Progress
Currently the Vault progress can not be viewed in-game (September 2018, open beta/Guilds of Ravnica patch). The Vault only becomes visible when it can be opened (100%/900 points).

Players can check their progress by looking at the game's log file: Please note: this procedure is not part of the official gameplay. Perform the steps above at your own risk.
 * 1) Go to the game options (icon top right shaped like a gear).
 * 2) Click "Report a Bug".
 * 3) Click "Capture Log".
 * 4) Open the displayed .htm file with a text editor.
 * 5) Search for the term.
 * 6) The number after this term is the current progress (percent).

Vault progress can be over 100%. Excess progress points will not be lost if a player decides to not open the Vault immediately. It is therefore possible to open the Vault several times consecutively. Opening the Vault simply subtracts 900 points from the total amount of progress points.