Hi @Brainbashborris,
The Vault doesn't limit progression. All the normal ways of getting cards is still available (crates, level rewards, cloning chambers), this is just another method that players can opt to use to help speed up their progression.
@JaroslavCZE,
I've pass along that it says Rare crates should give 20 cards to the rest of the team. Thanks.
For those who suddenly have the Vault show 0 cards: This is a visual glitch. You cards are still in there. If you restart the app or play a match, the correct number of cards should display.