What is MTG Arena vault?

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Tags

1. #opening
2. #reward
3. #collection
4. #vault
5. #economy
6. #adding
7. #magic
8. #receives
9. #quests
10. #player
11. #events
12. #added
13. #gathering
14. #arena
15. #points
16. #progress
17. #instead
18. #amount
19. #certain
20. #fifth