Please consider making the next changes or adjustments:
Gnomes and Valraven that are already at four copies, fully ascended and leveled, should no longer be present or met with the same card/s in the Vault - you should get a different reward.
If all Vault cards are already ascended and at four copies, then remove those from the stack.
Number 1: Getting tired of getting the same card/s that I already have but not the one/s I need.
Number 2: Good incentive for more money spending during the Vault Event for people who can now get a bit better chances or different rewards.
I hope you do the right thing.