What are steam cards used for?

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Tags

1. #which
2. #fulfilling
3. #users
4. #tasks
5. #random
6. #platform
7. #games
8. #trading
9. #issued
10. #physical
11. #distribution
12. #playing
13. #commodity
14. #chance
15. #valve
16. #digital
17. #corporation
18. #granted
19. #periodically
20. #cards
21. #analogue
22. #steam
23. #conventional